Mezzanine Loan Due December 2029
Mezzanine Loan Due December 2029 [Member]
Mezzanine Loan Due December 2029
Accumulated amortization
Finite-Lived Intangible Assets, Accumulated Amortization
Properties Sold in 2025, 2024 and 2023
Properties Sold In 2025, 2024, And 2023 [Member]
Properties Sold In 2025, 2024, And 2023
Schedule of Marketable Securities
Debt Securities, Available-for-Sale [Table Text Block]
Other
Other Affiliates [Member]
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in shares)
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings (in units)
Deferred Compensation Plan and Stock Award, Shares
Number of shares issued during the period from a Deferred Compensation Plan and Stock Award.
Award Timing Predetermined
Award Timing Predetermined [Flag]
Annual award vesting rate, high end of range (as a percent)
Share Based Compensation Arrangement by Share Based Payment Award, Award Vesting Rate, High End of Range
Represents the low end of the range of annual vesting rates that occurs once performance criteria are reached.
Operating lease costs before capitalized operating lease costs
Operating Lease, Cost, Before Capitalized Operating Lease Costs
Operating Lease, Cost, Before Capitalized Operating Lease Costs
Entity File Number
Entity File Number
Additional Paid- In-Capital
Additional Paid-in Capital [Member]
Revenue from Contract with Customer, Liability Type Axis [Domain]
Revenue from Contract with Customer, Liability Type Axis [Domain]
Revenue from Contract with Customer, Liability Type Axis [Domain]
Tabular List, Table
Tabular List [Table Text Block]
2 - Watch List Assets - Higher potential for loss (1)
Risk Level, Medium [Member]
Securitization Vehicles, Real Estate Loans In Excess Of Senior Obligations
Securitization Vehicles, Real Estate Loans In Excess Of Senior Obligations [Member]
Securitization Vehicles, Real Estate Loans In Excess Of Senior Obligations
Interest expense on senior obligations of consolidated securitization vehicles
Interest expense on senior obligations of consolidated securitization vehicles
Interest Expense On Senior Obligations Of Consolidated Securitization Vehicles
Interest Expense On Senior Obligations Of Consolidated Securitization Vehicles
Purchase price and other fair value adjustments
Purchase Price, Fair Value Adjustment, Gain (Loss)
Purchase Price, Fair Value Adjustment, Gain (Loss)
420 Lexington Avenue
Lexington Avenue, 420 [Member]
Represents the information pertaining to 420 Lexington Avenue, a property owned by the entity.
Accounting Standards Updates
New Accounting Pronouncements, Policy [Policy Text Block]
Term loan
Unsecured Term Loans
Term Loan [Member]
Represents the term loan of the reporting entity.
Schedule of amounts due from/to related parties
Schedule of Related Party Transactions [Table Text Block]
Fair Value, By Balance Sheet Grouping
Fair Value, by Balance Sheet Grouping [Table Text Block]
Measurement Basis [Axis]
Measurement Basis [Axis]
Adjustment to Compensation:
Adjustment to Compensation [Axis]
Related Party Transactions
Related Party Transactions Disclosure [Text Block]
Named Executive Officers, Footnote
Named Executive Officers, Footnote [Text Block]
Core Portfolio
Core Portfolio [Member]
Core Portfolio
Measurement adjustment for redeemable noncontrolling interest
Measurement Adjustment For Redeemable Noncontrolling Interest, Noncash Investing and Financing Activities
Measurement Adjustment For Redeemable Noncontrolling Interest, Noncash Investing and Financing Activities
Building & Improvements
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Building and Improvements, Amount
Current period recoveries
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery
Stock, Class of Stock [Table]
Stock, Class of Stock [Table]
Transaction Costs
Transaction Costs [Policy Text Block]
Transaction Costs [Policy Text Block]
Due from joint ventures
Corporate Joint Venture [Member]
Investment in sales-type leases
Sales-Type Lease, Net Investment in Lease, Excluding Accrued Interest, before Allowance for Credit Loss
Interest Rate Cap
Interest Rate Cap [Member]
Loan loss reserve activity
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Approximate square feet
Approximate Square Feet
Unaudited Approximate Usable Square Feet
Area of Real Estate Property
Adjustment to Compensation, Amount
Adjustment to Compensation Amount
Percentage of concentration (percent)
Concentration Risk, Percentage
Pension Plan
Pension Plan [Member]
Initial Cost
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost [Abstract]
Other assets
Increase (Decrease) in Other Operating Assets
Principles of Consolidation
Consolidation, Policy [Policy Text Block]
Share-based compensation
Share-Based Payment Arrangement, Noncash Expense
Notional Value
Notional Value
Derivative Asset, Notional Amount
Stock options
Share-Based Payment Arrangement, Option [Member]
Property, Plant and Equipment [Table]
Property, Plant and Equipment [Table]
Cash and Cash Equivalents
Cash and Cash Equivalents, Policy [Policy Text Block]
Income taxes paid
Income Taxes Paid
711 Third Avenue
Third Avenue, 711 [Member]
Represents the information pertaining to 711 Third Avenue, a property owned by the entity.
SL Green partners' capital, limited partner common units outstanding (shares)
Limited Partnership Units Held by General Partner
This element represents Limited Partnership Units Held by General Partner.
Total SL Green stockholders' equity
Equity, Attributable to Parent
Other comprehensive (loss) income:
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Insider Trading Policies and Procedures [Line Items]
Preferred units distributions
Noncontrolling Interest in Net Income (Loss) Preferred Unit Holders, Redeemable
Schedule of Estimated Useful Lives
Property, Plant and Equipment [Table Text Block]
Common stock, shares authorized (in shares)
Common Stock, Shares Authorized
Retirements/disposals/deconsolidation
Real Estate, Accumulated Depreciation Real Estate Sold Retired or Deconsolidated
The amount that was removed from accumulated depreciation pertaining to real estate that was sold, retired or deconsolidated in the period.
Proceeds from issuance of common stock (in shares)
Issuance of common stock (in shares)
Stock Issued During Period, Shares, New Issues
LTIP units
Long Term Incentive Plan Units [Member]
LTIP units as awarded by a company to its employees as a form of incentive compensation.
September 2028
Interest Rate Swap Expiring September 2028, 2 [Member]
Interest Rate Swap Expiring September 2028, 2
Expected equity ownership percentage
Special Purpose Entity, Percentage of Expected Ownership by Partner
Special Purpose Entity, Percentage of Expected Ownership by Partner
Concentrations of Credit Risk
Concentration Risk, Credit Risk, Policy [Policy Text Block]
November 2027
Interest Rate Swap Expiring in November 2027 [Member]
Interest Rate Swap Expiring in November 2027
Liabilities and equity
Liabilities and Equity [Abstract]
Fund subscription line ⁽³⁾
CMBS Repurchase Facility [Member]
CMBS Repurchase Facility
Cover [Abstract]
Cover [Abstract]
Accumulated Amortization of Deferred Costs
Accumulated Amortization of Deferred Costs
Accumulated Amortization of Deferred Costs
Portion at Fair Value Measurement
Portion at Fair Value Measurement [Member]
Property Dispositions and Properties Held for Sale
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]
Maximum
Maximum [Member]
Options exercisable at end of period (in dollars per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price
Estimated useful life of other intangible assets (in years)
Finite-Lived Intangible Asset, Useful Life
Plan contributions
Multiemployer Plan, Pension, Significant, Plan Contribution
Net loss (income) attributable to noncontrolling interests and preferred units distributions
Net loss attributable to noncontrolling interests
Net Income (Loss) Attributable to Noncontrolling Interest
Series K
Series K Preferred Stock [Member]
Series K Preferred Stock [Member]
Conversion Price Per Unit (in dollars per share)
Operating Partnership Common Unit Value, Per Share Use for Conversion
Represents the common stock value per share which is used for purposes of determining the number of operating partnership common stock issue on conversion of preferred unit.
Multiemployer plans, surcharge
Multiemployer Plan, Pension, Significant, Surcharge [Fixed List]
Total, net
Finite-Lived Intangible Assets, Net
Restricted Stock Awards
Restricted Stock [Member]
Non-PEO NEO Average Total Compensation Amount
Non-PEO NEO Average Total Compensation Amount
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, by Property [Table]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, by Property [Table]
Debt Instrument [Line Items]
Corporate Indebtedness
Debt Instrument [Line Items]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Deferred costs, net of amortization of $174,617 and $308,923, respectively
Deferred Costs
Adjustment to Non-PEO NEO Compensation Footnote
Adjustment to Non-PEO NEO Compensation Footnote [Text Block]
Financing Receivable, Credit Quality Indicator [Table]
Financing Receivable, Credit Quality Indicator [Table]
Retirement Benefits [Abstract]
Retirement Benefits [Abstract]
Forgone Recovery due to Disqualification of Tax Benefits, Amount
Forgone Recovery due to Disqualification of Tax Benefits, Amount
Other Assets
Other Assets [Member]
Suburban
Suburban [Member]
Represents information pertaining to property located in Suburban areas.
Partners' Capital, Master Limited Partnership, Preferred Unit [Table]
Partners' Capital, Master Limited Partnership, Preferred Unit [Table]
Non-Rule 10b5-1 Arrangement Terminated
Non-Rule 10b5-1 Arrangement Terminated [Flag]
Entity Shell Company
Entity Shell Company
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-Term Debt Instruments [Table]
Proceeds from issuance of debt
Proceeds from Issuance of Debt
Statement of Financial Position Location, Activity, Accrual [Axis]
Statement of Financial Position Location, Activity, Accrual [Axis]
Changes in accumulated depreciation
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Statement of Stockholders' Equity [Abstract]
Statement of Stockholders' Equity [Abstract]
Operating Segments
Operating Segments [Member]
Capitalized to assets associated with compensation expense related to our long-term compensation plans, restricted stock and stock options
Share-Based Payment Arrangement, Amount Capitalized
Award Timing MNPI Considered
Award Timing MNPI Considered [Flag]
Company's share of contributed amount
Investment Company, Debt Fund Investments, Contributed Amount, Company Share
Investment Company, Debt Fund Investments, Contributed Amount, Company Share
Removal of fully depreciated commercial real estate properties
Removal of Fully Depreciated Real Estate Assets
Removal of Fully Depreciated Real Estate Assets
Other obligation related to secured borrowing
Proceeds From Other Obligation Related To Secured Borrowing
Proceeds From Other Obligation Related To Secured Borrowing
Acquisition of subsidiary interest from noncontrolling interest
Payments to Noncontrolling Interests
Schedule of Estimated Annual Amortization of all Other Identifiable Assets
Schedule of Other Identifiable Assets, Future Amortization Expense [Table Text Block]
Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for all identifiable assets other than acquired below-market leases and acquired above-market leases.
Preferred Units, shares authorized (in shares)
Preferred Units, Authorized
Weighted average amortization period, above-market lease costs
Weighted Average Amortization Period, Above-Market Lease Costs
Weighted Average Amortization Period, Above-Market Lease Costs
Related party receivables
Other Receivables
Deferred net gains (losses) from terminated hedges
Other Comprehensive Income (Loss), Deferred Net Gain (Loss) from Terminated Hedges
Other Comprehensive Income (Loss), Deferred Net Gain (Loss) from Terminated Hedges
Interest rate, fixed rate debt (as a percent)
Long-Term Debt, Percentage Bearing Fixed Interest, Percentage Rate
Gain on sale of marketable securities
Gain on sale of investments in marketable securities
Marketable Security, Realized Gain (Loss)
Document Fiscal Period Focus
Document Fiscal Period Focus
Company's share of committed capital
Investment Company, Debt Fund Investments, Share Of Capital Committed
Investment Company, Debt Fund Investments, Share Of Capital Committed
Real estate taxes
Real Estate Tax Expense
Net income (loss)
Profit Loss, Less Preferred Distributions
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest, less preferred distributions during the period.
Award Timing Method
Award Timing Method [Text Block]
Net loss attributable to noncontrolling interests:
Net Loss Attributable to Noncontrolling Interest
Net Income (Loss) Attributable to Noncontrolling Interest [Abstract]
121 Greene Street
Greene Street 121 [Member]
Greene Street 121 [Member]
Mortgages and Other Loans Payable
Mortgages and Other Loans Payable [Abstract]
-- None. No documentation exists for this element. --
Cost basis of commercial mortgage backed securities
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss
Furniture and fixtures
Furniture and Fixtures [Member]
Other comprehensive income (loss)
Other Comprehensive Income (Loss), Net of Tax, Less Portion Attributable to Noncontrolling Interest
Other Comprehensive Income (Loss), Net of Tax, Less Portion Attributable to Noncontrolling Interest
Award Type [Axis]
Award Type [Axis]
Holiday And Mathias
Holiday And Mathias [Member]
Holiday And Mathias [Member]
800 Third Avenue
Third Avenue, 800 [Member]
Represents the information pertaining to 800 Third Avenue, a joint venture property of the entity.
2028
Sales-Type and Direct Financing Leases, Payment to be Received, Year Three
Deferred lease costs
Increase (Decrease) in Deferred Leasing Fees
February 2027
Interest Rate Swap Expiring in February 2027, 3 [Member]
Interest Rate Swap Expiring in February 2027, 3
Investment, Name [Domain]
Investment, Name [Domain]
Stock Based Employee Compensation Plans
Share-Based Payment Arrangement [Policy Text Block]
Trading Symbol
Trading Symbol
2029
Lessee, Operating Lease, Liability, to be Paid, Year Four
Capitalized interest
Capitalized Interest Costs, Including Allowance for Funds Used During Construction
Number of units of operating partnership owned by the noncontrolling interest unit holders (shares)
Number of units of operating partnership owned by the noncontrolling interest unit holders (units)
Minority Interest Units of Partnership Owned by Noncontrolling Owners
Represents the number of partnership units owned by the noncontrolling unit holders.
Schedule of Identified Intangible Assets and Intangible Liabilities
Schedule of Intangible Assets and Liabilities [Table Text Block]
Tabular disclosure of the aggregate amount of intangible assets and liabilities.
304 Park Avenue
Park Avenue 304 [Member]
Represents information pertaining to property located at 304 Park Avenue, owned by the entity.
Entity Address, City or Town
Entity Address, City or Town
85 Fifth Avenue
85 Fifth Avenue [Member]
85 Fifth Avenue
Non-PEO NEO Average Compensation Actually Paid Amount
Non-PEO NEO Average Compensation Actually Paid Amount
Statement of Income Location, Balance [Domain]
Statement of Income Location, Balance [Domain]
Compensation Actually Paid vs. Other Measure
Compensation Actually Paid vs. Other Measure [Text Block]
Entity Emerging Growth Company
Entity Emerging Growth Company
2028
Long-Term Debt, Maturity, Year Three
245 Park Avenue
Park Avenue, 245 [Member]
Park Avenue, 245
Servicing liability at amortized cost, balance
Servicing Liability at Amortized Cost, Balance
Balance at beginning of year (in shares)
Balance at end of period (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number
Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year
Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member]
Deferred financing costs, net
Debt Issuance Costs, Net
Preferred unit distributions as a percentage of common unit distributions
Share Based Compensation Arrangement by Share Based Payment Award, Preferred Unit Distributions as a Percentage of Common Unit Distributions
Share Based Compensation Arrangement by Share Based Payment Award, Preferred Unit Distributions as a Percentage of Common Unit Distributions
Giorgio Armani Residences at 760 Madison Avenue (3 Condominium Units)
Giorgio Armani Residences at 760 Madison Avenue (3 Condominium Units) [Member]
Giorgio Armani Residences at 760 Madison Avenue (3 Condominium Units)
Restricted cash
Restricted Cash and Cash Equivalent
Amount representing interest
Finance Lease, Liability, Undiscounted Excess Amount
February 2026
Interest Rate Swap Expiring in February 2026 [Member]
Interest Rate Swap Expiring in February 2026
Common stock, shares outstanding (in shares)
Common Stock, Shares, Outstanding
Conversion of stock, shares issued (in shares)
Conversion of Stock, Shares Issued
Commercial mortgage-backed securities - held-to-maturity
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss
Collective Bargaining Arrangements
Workforce Subject to Collective-Bargaining Arrangements [Member]
May 2027
Interest Rate Swap Expiring in May 2027 [Member]
Interest Rate Swap Expiring in May 2027
Consolidated
Consolidated Properties [Member]
Internal Revenue Service (IRS)
Internal Revenue Service (IRS) [Member]
Weighted Average Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Roll Forward]
Building & Improvements
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Building and Improvements
Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year
Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Accounts payable and accrued expenses
Accounts Payable and Accrued Liabilities
Principal Repayments and Joint Venture Debt
Maturities of Long-Term Debt [Abstract]
Summary of restricted stock
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
Restatement Determination Date
Restatement Determination Date
Federal, state and local tax provision
Income Tax Expense (Benefit)
Investments in real estate loans held by consolidated securitization vehicles
Payments to Acquire Loans Receivable
Interest rate added to base rate (as a percent)
Debt Instrument, Basis Spread on Variable Rate
Identified intangible assets (included in other assets):
Finitely Lived Intangible Assets [Abstract]
-- None. No documentation exists for this element. --
Other assets
Other Assets
Document Information [Line Items]
Document Information [Line Items]
Preferred stock, shares issued (in shares)
Preferred Stock, Shares Issued
Unsecured notes, net
Unsecured Debt
Pension Adjustments Service Cost
Pension Adjustments Service Cost [Member]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
(Decrease) increase in unrealized value of derivative instruments, including SL Green's share of joint venture derivative instruments
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations and Disposal Groups [Abstract]
Compensation Actually Paid vs. Company Selected Measure
Compensation Actually Paid vs. Company Selected Measure [Text Block]
June 2027
Interest Rate Swap Expiring in June 2027 [Member]
Interest Rate Swap Expiring in June 2027
Schedule of Activity in Debt and Preferred Equity Investments
Schedule Of Debt And Preferred Equity Book Balance Roll Forward [Table Text Block]
Schedule Of Debt And Preferred Equity Book Balance Roll Forward
Ticonderoga
Ticonderoga Insurance Company [Member]
Ticonderoga Insurance Company [Member]
January 2028
Interest Rate Swap Expiring in January 2028 [Member]
Interest Rate Swap Expiring in January 2028
Proceeds from stock options exercised and DRSPP issuance
Proceeds from Stock Options Exercised
All Trading Arrangements
All Trading Arrangements [Member]
Equity Awards Adjustments, Footnote
Equity Awards Adjustments, Footnote [Text Block]
Total Shareholder Return Vs Peer Group
Total Shareholder Return Vs Peer Group [Text Block]
Ownership interest
Lessee, Fee Interest Ownership Percentage
Lessee, Fee Interest Ownership Percentage
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
Awards outstanding (in shares)
Balance at beginning of year (in shares)
Balance at end of period (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Abstract]
Manhattan
Manhattan [Member]
Represents information pertaining to properties located in Manhattan.
2026
Below Market Lease, Amortization Income, Year One
Noncontrolling interests in other partnerships
Net Income (Loss) Attributable to Other Partnerships
Net Income (Loss) Attributable to Other Partnerships
Net Income (Loss) Attributable to Other Partnerships
Net cash provided by operating activities
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation
May 2028
Interest Rate Swap Expiring in May 2028 [Member]
Interest Rate Swap Expiring in May 2028
Add back: undistributed earnings allocated to participating securities
Distributed Earnings, Diluted
Distributed Earnings, Diluted
Initial Term (in Years)
Debt Instrument, Term
Proceeds from sale of marketable securities
Proceeds from Sale of Debt Securities, Available-for-Sale
Commercial mortgage-backed securities - available-for-sale
Marketable securities available-for-sale
Debt Securities, Available-for-Sale, Excluding Accrued Interest
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments and Joint Ventures [Abstract]
O 2025 A Dividends
O 2025 A Dividends [Member]
O 2025 A Dividends
Estimated useful life (in years)
Property, Plant and Equipment, Useful Life
Preferred stock, par (in dollars per share)
Preferred stock, par (in dollars per share)
Preferred Stock, Par or Stated Value Per Share
Schedule of Multiemployer Plans [Table]
Multiemployer Plan [Table]
Subsequent Event
Subsequent Event [Member]
Schedule of Weighted Average Assumptions Used To Estimate The Grant Date Fair Value of Options Granted
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Real Estate [Line Items]
Real Estate [Line Items]
Interest expense, net
Interest Income (Expense), Operating
Schedule of Equity Method Investments [Line Items]
General information on each joint venture
Investment in Unconsolidated Joint Ventures
Schedule of Equity Method Investments [Line Items]
Management Service, Base
Management Service, Base [Member]
Equity Valuation Assumption Difference, Footnote
Equity Valuation Assumption Difference, Footnote [Text Block]
PEO Total Compensation Amount
PEO Total Compensation Amount
Long-term Debt, Type [Axis]
Long-Term Debt, Type [Axis]
Investment in CMBS Securitization Trusts
Investment in CMBS Securitization Trusts [Policy Text Block]
Investment in CMBS Securitization Trusts
2029
Finance Lease, Liability, to be Paid, Year Four
Interest rate cap and swap agreements (included in accrued interest payable and other liabilities)
Derivative Liability, Subject to Master Netting Arrangement, before Offset
Basic Shares:
Weighted Average Number of Shares Outstanding, Basic [Abstract]
Weighted average fair value of options granted during the period
Total fair value of restricted stock granted during the year
Share Based Compensation Arrangement by Share Based Payment Award, Grants in Period Fair Value
Represents the weighted average fair value of awards granted during the period.
Equity Components [Axis]
Equity Components [Axis]
2022
Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Line Items]
Real estate properties
Real Estate Properties [Line Items]
Sublease Income
Sublease Income
Non-Rule 10b5-1 Arrangement Adopted
Non-Rule 10b5-1 Arrangement Adopted [Flag]
Number of reportable segments
Number of Reportable Segments
Measurement adjustment for redeemable noncontrolling interest
Measurement Adjustment For Redeemable Noncontrolling Interest
Measurement Adjustment For Redeemable Noncontrolling Interest
December 2026
Interest Rate Swap Expiring December 2026 [Member]
Interest Rate Swap Expiring December 2026
Entity Address, State or Province
Entity Address, State or Province
Thereafter
Sales-Type and Direct Financing Leases, Payment to be Received, after Year Five
Property acquisitions
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Other Acquisition
Financial Asset, Period Past Due [Domain]
Financial Asset, Aging [Domain]
Contribution to consolidated joint venture by noncontrolling interest
Increase (Decrease) in Noncontrolling Interest in Joint Ventures
Increase (Decrease) in Noncontrolling Interest in Joint Ventures
Cash distributions declared
Dividends, Common Stock
Real estate loans held by consolidated securitization vehicles (includes $1,023,877 and $584,134 at fair value as of December 31, 2025 and December 31, 2024, respectively)
Servicing asset
Servicing Asset
885 Third Avenue
Third Avenue, 885 [Member]
Represents the information pertaining to 885 Third Avenue, a property owned by the entity.
Diluted weighted average common units and common unit equivalents outstanding (in shares)
Weighted Average Limited Partnership Units Outstanding, Diluted
Individual:
Individual [Axis]
Matching contribution
Defined Contribution Plan, Cost
Multiemployer plans, contributions by employer, percent
Multiemployer Plans, Contributions By Employer, Percent
Multiemployer Plans, Contributions By Employer, Percent
Document Annual Report
Document Annual Report
Servicing asset at amortized cost
Servicing Asset at Amortized Cost
Contributions from noncontrolling interests to debt fund investments
Proceeds from Noncontrolling Interests
Mezzanine Debt
Mezzanine Debt [Member]
Mezzanine Debt [Member]
Forgone Recovery, Explanation of Impracticability
Forgone Recovery, Explanation of Impracticability [Text Block]
Noncontrolling interest in the operating partnership (as a percent)
Subsidiary, Ownership Percentage, Noncontrolling Owner
Lease Income
Lessor, Sales-type Leases [Text Block]
Entity Interactive Data Current
Entity Interactive Data Current
Net (loss) income attributable to SLGOP common unitholders
Net (Loss) income attributable to SLGOP common unitholders (numerator for diluted earnings per unit)
Net Income (Loss) Allocated to, Common Unitholders
This element represents amounts attributable to ROP common unitholders.
2028
Below Market Lease, Amortization Income, Year Three
2027
Below Market Lease, Amortization Income, Year Two
Andrew Mathias, President
Andrew Mathias, President [Member]
Andrew Mathias, President [Member]
Series L
Series L Preferred Stock [Member]
Series L Preferred Stock [Member]
Weighted Average Occupancy (as a percent)
Real Estate, Weighted Average Leased Occupancy
Real Estate, Weighted Average Leased Occupancy
Accounts payable, accrued expenses, other liabilities and security deposits
Increase (Decrease) in Accrued Liabilities and Other
The change during the period in carrying value of accounts payable, accrued expenses and fair value of hedges, due within one year or operating cycle.
Schedule of Debt Investments with an Aggregate Weighted Average Current Yield
Schedule of Mortgage Loans on Real Estate [Table Text Block]
Schedule of Mortgage Loans on Real Estate
Investments in marketable securities
Total investment in marketable securities
Marketable Securities
Property, Plant and Equipment, Type [Axis]
Long-Lived Tangible Asset [Axis]
Operating Lease Costs
Operating Lease, Cost [Abstract]
Operating Lease, Cost [Abstract]
Ownership [Domain]
Ownership [Domain]
Land
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Initial Cost of Land
2027
Finance Lease, Liability, to be Paid, Year Two
Lessor, Operating Lease, Payments To Be Received, Maturity
Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block]
Preferred units, liquidation preference (in dollars per share)
Liquidation preference of preferred units (in dollars per share)
Temporary Equity, Liquidation Preference Per Share
Senior obligations of consolidated securitization vehicles (includes $1,023,877 and $567,487 at fair value as of December 31, 2025 and December 31, 2024, respectively)
Senior obligations
Servicing Liability
Total floating rate
Floating Rate
Debt Investment with Floating Interest Rate [Member]
Represents the debt investment in mortgage loans having a floating interest rate.
Auditor [Table]
Auditor [Table]
Face Value
Investment Owned, Face Amount
SUMMIT Operator tax expense
Segment, Operator Tax Expenses
Segment, Operator Tax Expenses
Weighted average amortization period, below-market lease costs
Weighted Average Amortization Period, Below-Market Lease Costs
Weighted Average Amortization Period, Below-Market Lease Costs
Number of fungible units available for grant
Share-based Compensation Arrangement By Share-based Payment Award, Number Of Fungible Units Available For Grant
Share-based Compensation Arrangement By Share-based Payment Award, Number Of Fungible Units Available For Grant
Customer [Domain]
Customer [Domain]
Entity Central Index Key
Entity Central Index Key
PEO Name
PEO Name
Total, net
Finite Lived Intangible Liabilities, Net
Represents the sum of gross carrying value of a major finite-lived intangible liability class, less accumulated amortization.
485 Lexington Avenue
485 Lexington Avenue [Member]
485 Lexington Avenue
Schedule of combined aggregate principal maturities
Schedule of Maturities of Long-Term Debt [Table Text Block]
Total revenues
Revenues
Revenues
Preferred Units [Line Items]
Preferred Units [Line Items]
Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year
Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member]
June 2028
Interest Rate Swap Expiring in June 2028 [Member]
Interest Rate Swap Expiring in June 2028
Related party receivables
Increase (Decrease) in Due from Related Parties, Current
Outstanding Aggregate Erroneous Compensation Amount
Outstanding Aggregate Erroneous Compensation Amount
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Office
Office Building [Member]
Portfolio [Domain]
Portfolio [Domain]
Portfolio [Domain]
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Madison Avenue, 625, Transaction 2
Madison Avenue, 625, Transaction 2 [Member]
Madison Avenue, 625, Transaction 2
Final extended term
Investment Company, Debt Fund Investments, Final Closing, Term Extension
Investment Company, Debt Fund Investments, Final Closing, Term Extension
Exercise Price
Award Exercise Price
Entity Filer Category
Entity Filer Category
Tenant 1
Tenant 1 [Member]
Represents first tenant of the entity for which a concentration risk is disclosed.
Class of Stock [Domain]
Class of Stock [Domain]
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Third Amendment and Restated 2005 Stock Option and Incentive Plan
Third Amendment and Restated 2005 Stock Option and Incentive Plan [Member]
Third Amendment and Restated 2005 Stock Option and Incentive Plan [Member]
Class O LTIP Units
Class O LTIP Units [Member]
Class O LTIP Units [Member]
Unused and Unexpired Tickets
Unused And Unexpired Tickets [Member]
Unused And Unexpired Tickets
Schedule of Preferred Unit Activity
Schedule of Preferred Units [Table Text Block]
1350 Avenue of the Americas
Avenue of the Americas 1350 [Member]
Represents information pertaining to 1350 Avenue of the Americas, a property owned by the entity.
Term Loan B, Maturity November 21, 2024
Term Loan B, Maturity November 21, 2024 [Member]
Term Loan B [Member]
Sales price
Gross asset valuation
Disposal Group, Including Discontinued Operation, Consideration
Organization
Organization
Ownership Interests [Line Items]
-- None. No documentation exists for this element. --
Health Plan
Postretirement Health Coverage [Member]
Statement of Financial Position Location, Balance [Axis]
Statement of Financial Position Location, Balance [Axis]
2028
Finite-Lived Intangible Asset, Expected Amortization, Year Three
December 2026
Interest Rate Swap Expiring December 2026, 1 [Member]
Interest Rate Swap Expiring December 2026, 1
Gross amount
Finite-Lived Intangible Assets, Gross
Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year
Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member]
Entity Address, Address Line One
Entity Address, Address Line One
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent [Member]
Investment [Domain]
Investments [Domain]
Madison Avenue, 625, Transaction 1
Madison Avenue, 625, Transaction 1 [Member]
Madison Avenue, 625, Transaction 1
Internal Credit Assessment [Axis]
Internal Credit Assessment [Axis]
Schedule of Interests in Investment Properties
Schedule of Real Estate Properties [Table Text Block]
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]
Internal Credit Assessment [Domain]
Internal Credit Assessment [Domain]
Ownership [Axis]
Ownership [Axis]
Stabilization of property, three years or more after stabilization, percent
Related Party Transaction, Stabilization Of Property, Three Years Or More After Stabilization, Percent
Related Party Transaction, Stabilization Of Property, Three Years Or More After Stabilization, Percent
Financial Instruments: Derivatives and Hedging
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Property Dispositions and Assets Held for Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Increase (reduction) in rental revenue label
Rental Revenue Increase (Decrease) Acquired Lease Amortization
Represents the increase (decrease) in rental revenue during the period resulting from the net amortization of acquired above-market and below-market leases.
Name of Property [Domain]
Name of Property [Domain]
Distributions from debt fund investments
Noncontrolling Interest, Increase From Distributions
Noncontrolling Interest, Increase From Distributions
Fair Value as of Grant Date
Award Grant Date Fair Value
Contributions to consolidated joint venture interests
Contributions to consolidated joint venture interests
Consolidation of Joint Venture Interest
This element represent the net income (loss) in consolidation of joint venture interest.
Schedule of Common Stock Issued and Proceeds Received Dividend Reinvestments
Schedule of Common Stock Issued and Proceeds Received Dividend Reinvestments [Table Text Block]
Schedule of Common Stock Issued and Proceeds Received Dividend Reinvestments [Table Text Block]
Loan modification amount
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Modification Amount
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Modification Amount
2021
Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year
Other Identifiable Assets
Other Identifiable Assets [Member]
Represents all identifiable assets other than acquired above-market and below-market leases.
Schedule of senior unsecured notes and other related disclosures by scheduled maturity date
Schedule of Long-Term Debt Instruments [Table Text Block]
Non-operating net loss from unconsolidated joint ventures
Non-Operating Net Income (Loss) from Unconsolidated Joint Ventures
Non-Operating Net Income (Loss) from Unconsolidated Joint Ventures
Stock-based compensation plans (in shares)
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements
Awards granted (in shares)
Granted (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period
Fund purchased
Payments to Acquire Investments
Write down of value in leasehold interest
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount
Consolidation of partially owned entity
Consolidation Of Partially Owned Entity
Consolidation Of Partially Owned Entity
Cancelled (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Total unrecognized compensation cost related to unvested stock awards
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
Related Party Transaction [Line Items]
Related Party Transaction [Line Items]
Add back: effect of dilutive securities (redemption of units to common shares)
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities
Fair value of security in a continuous unrealized loss position for less than 12 months
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months
Schedule of Other Share-based Compensation, Activity
Share-Based Payment Arrangement, Outstanding Award, Activity, Excluding Option [Table Text Block]
Total debt
Long-Term Debt, Fair Value
Changed Peer Group, Footnote
Changed Peer Group, Footnote [Text Block]
Counterparty Name [Domain]
Counterparty Name [Domain]
Sales-type And Direct Financing Leases, Lease Receivable, Maturity
Sales-Type and Direct Financing Leases, Payment to be Received, Maturity [Table Text Block]
2027
Lessee, Operating Lease, Liability, to be Paid, Year Two
Adjustment To PEO Compensation, Footnote
Adjustment To PEO Compensation, Footnote [Text Block]
Remaining weighted average contractual life of the options outstanding (in years)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term
Acquisitions of real estate property
Payments to Acquire Commercial Real Estate
January 2026
Interest Rate Cap Expiring January 2026 [Member]
Interest Rate Cap Expiring January 2026
Investment [Axis]
Investment Type [Axis]
Title
Trading Arrangement, Individual Title
Peer Group Total Shareholder Return Amount
Peer Group Total Shareholder Return Amount
Underwriting Commissions and Costs
Underwriting Commissions and Costs, Policy [Policy Text Block]
Underwriting Commissions and Costs, Policy [Policy Text Block]
Share repurchase or redemption payable
Share Repurchases Or Redemption Payable
Share Repurchases Or Redemption Payable
February 2027
Interest Rate Swap Expiring in February 2027, 2 [Member]
Interest Rate Swap Expiring in February 2027, 2
SL Green partner's capital, general partner common units outstanding (shares)
General Partners' Capital Account, Units Outstanding
Schedule of Ownership Interests [Line Items]
Schedule of Ownership Interests [Line Items]
Schedule of Ownership Interests [Line Items]
One Vanderbilt Avenue
One Vanderbilt Avenue [Member]
One Vanderbilt Avenue
Non-PEO NEO
Non-PEO NEO [Member]
Letters of credit
Letters of Credit Outstanding, Amount
11 West 34th Street
West 11 Street 34 [Member]
Represents the information pertaining to 11 West 34th Street, a joint venture property of the entity.
Third-Party
Third-Party [Member]
Third-Party
Schedule of Ownership Interests [Table]
Schedule of Ownership Interests [Table]
Represents information related to ownership interests held by the entity.
Stated Distribution Rate
Dividend rate preferred units (as a percent)
Preferred Stock, Dividend Rate, Percentage
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss) [Line Items]
750 Third Avenue
Third Avenue, 750 [Member]
Represents the information pertaining to 750 Third Avenue, a property owned by the entity.
Redemptions/sales/syndications/equity ownership/amortization
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Amortization of Premium
Stockholders Equity [Table]
Stockholders Equity [Table]
Disclosure of information pertaining to changes in stockholders' equity during the period.
Allowance for loan loss
Financing Receivable, Allowance for Credit Loss
Award Type [Domain]
Award Type [Domain]
Initial closing term
Investment Company, Debt Fund Investments, Initial Closing Term
Investment Company, Debt Fund Investments, Initial Closing Term
Payment of debt extinguishment costs
Payment for Debt Extinguishment or Debt Prepayment Cost
2026
Lessee, Operating Lease, Liability, to be Paid, Year One
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax
245 Park Avenue
245 Park Avenue [Member]
245 Park Avenue
Authorized shares, par value (in dollars per share)
Total Par or Stated Value Per Share
Face amount or stated value of capital stock per share; generally not indicative of the fair market value per share.
Debt and preferred equity investments, net of discounts and deferred origination fees
Discount of Structured Finance Investments
Discount of Structured Finance Investments
Equity Awards Adjustments
Equity Awards Adjustments [Member]
Other non-cash adjustments
Other Noncash Income (Expense)
Korean Institutional Investor / Israeli Institutional Investor
Korean Institutional Investor / Israeli Institutional Investor [Member]
Korean Institutional Investor / Israeli Institutional Investor
Pension Benefits Adjustments, Footnote
Pension Benefits Adjustments, Footnote [Text Block]
Other income
Other Income
Compensation Amount
Outstanding Recovery Compensation Amount
SUMMIT Operator tax expense
Segment, Operator Tax Expense (Benefit)
Segment, Operator Tax Expense (Benefit)
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Dividend yield (as a percent)
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Deferred rents receivable
Straight Line Rent
Depreciation and amortization
Depreciation, Depletion and Amortization, Nonproduction, Adjustment
Depreciation, Depletion and Amortization, Nonproduction, Adjustment
Recovery of Erroneously Awarded Compensation Disclosure [Line Items]
Fair Value
Estimate of Fair Value Measurement [Member]
Non-cancellable operating leases
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Multiemployer Plans Type [Domain]
Retirement Plan Type [Domain]
MNPI Disclosure Timed for Compensation Value
MNPI Disclosure Timed for Compensation Value [Flag]
Accumulated Other Comprehensive Income (Loss) of the Company [Roll Forward]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Depreciable real estate reserves and impairments
Depreciable Real Estate Reserves and Impairments
Depreciable Real Estate Reserves and Impairments
Employee Stock
Employee Stock [Member]
Revenues
Revenues [Abstract]
Mezzanine Loan Due January 2026
Mezzanine Loan Due January 2026 [Member]
Mezzanine Loan Due January 2026
Documents Incorporated by Reference
Documents Incorporated by Reference [Text Block]
Estimated fair value of debt and preferred equity investments, low end of range
Mortgage Loans on Real Estate, Fair Value, Low End of Range
Represents the low end of the range of estimated fair value for investments in mortgage loans on real estate.
Encumbrances
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Amount of Encumbrances
Principal Value
Principal Value [Abstract]
Principal Value
Accumulated other comprehensive (loss) income
Accumulated Other Comprehensive Income (Loss), Net of Tax
485 Lexington Avenue
Lexington Avenue, 485 [Member]
Represents the information pertaining to 485 Lexington Avenue, a property owned by the entity.
Fixed Rate
Total fixed rate
Fixed Rate [Member]
Fixed Rate [Member]
2026
Long-Term Debt, Maturity, Year One
Financial Instruments [Domain]
Financial Instruments [Domain]
Increase (decrease) in unrealized value of marketable securities
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax
Portfolio [Axis]
Portfolio [Axis]
Portfolio
2030
Long-Term Debt, Maturity, Year Five
1 - Low Risk Assets - Low probability of loss
Risk Level, Low [Member]
Series I Preferred Stock
Series I Preferred Units
Series I Preferred Stock [Member]
Outstanding nonredeemable series I preferred stock or outstanding series I preferred stock. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer.
Aggregate termination value
Assets Needed for Immediate Settlement, Aggregate Fair Value
Performance Shares
Performance Shares [Member]
Stock options, stock appreciation rights and other awards
Stock Options Stock Appreciation Rights and Other Awards [Member]
Represents the stock options, stock appreciation rights and other awards granted by the entity. Thes do not deliver full value and have an expiration date.
Aggregate Pension Adjustments Service Cost
Aggregate Pension Adjustments Service Cost [Member]
Extinguishment of debt
Extinguishment Of Debt In Connection With Property Dispositions
Extinguishment Of Debt In Connection With Property Dispositions
Finite-Lived Intangible Assets by Major Class [Axis]
Finite-Lived Intangible Assets by Major Class [Axis]
2029
Sales-Type and Direct Financing Leases, Payment to be Received, Year Four
Minimum
Minimum [Member]
Days past due for income recognition on debt and preferred equity investments to be suspended
Financing Receivable Number of Days Past Due for Suspending Income Recognition
The number of days by which payments become past due, at which income recognition on financing receivables is generally suspended.
Income Tax Authority, Name [Domain]
Income Tax Authority, Name [Domain]
Partnership Interest
Partnership Interest [Member]
Mortgages and Other Loans Payable [Table]
Mortgages and Other Loans Payable [Table]
Mortgages and Other Loans Payable
Company Selected Measure Name
Company Selected Measure Name
Fair Value Measurement [Domain]
Fair Value Measurement [Domain]
Mortgages and Other Loans Payable
Corporate Indebtedness
Debt Disclosure [Text Block]
Aggregate Available
Trading Arrangement, Securities Aggregate Available Amount
Stock Appreciation Rights (SARs)
Stock Appreciation Rights (SARs) [Member]
Dividend and distributions payable
Dividends Payable
Net (loss) income attributable to SL Green common stockholders, diluted
Net Income (Loss) Available to Common Stockholders, Diluted
June 2026
Interest Rate Cap Expiring in June 2026 [Member]
Interest Rate Cap Expiring in June 2026
Preferred Equity Investments
Preferred Equity Investments in Mortgage Loans [Member]
Represents preferred equity investments in mortgage loans on real estate.
Stockholders' Equity Note [Abstract]
Stockholders' Equity Note [Abstract]
Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Diluted weighted average common shares and common share equivalents outstanding (in shares)
Diluted weighted average common stock outstanding (in shares)
Weighted Average Number of Shares Outstanding, Diluted
Conversion of units in the Operating Partnership to common stock (in shares)
Conversion of common units (in units)
Stock Issued During Period, Shares, Conversion of Units
Non-GAAP Measure Description
Non-GAAP Measure Description [Text Block]
Derivative [Table]
Derivative [Table]
O 2023 A Dividends
O 2023 A Dividends [Member]
O 2023 A Dividends
Exchange of preferred equity investment for real estate
Exchange Of Preferred Equity Investment For Real Estate Or Equity In Joint Venture
Exchange Of Preferred Equity Investment For Real Estate Or Equity In Joint Venture
National Pension Service of Korea / Hines Interest LP / International Investor
National Pension Service of Korea / Hines Interest LP / International Investor [Member]
National Pension Service of Korea / Hines Interest LP / International Investor
Entity Small Business
Entity Small Business
Managed Office Properties
Managed Office Properties [Member]
Represents the office properties managed by the entity.
Limited partner interests in Operating Partnership, limited partner common units outstanding (shares)
Limited Partners' Capital Account, Units Outstanding
Transaction related costs
Other Cost and Expense, Operating
Total mortgages and other loans payable
Secured Debt, Gross
Secured Debt, Gross
Preferred stock, shares outstanding (in shares)
Preferred Stock, Shares Outstanding
2030
Below Market Lease, Amortization Income, Year Five
Document Transition Report
Document Transition Report
Schedule of Properties Contributed of Annualized Cash Rent
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
Total minimum lease payments
Finance Lease, Liability, to be Paid
Underlying Securities
Award Underlying Securities Amount
Statement of Partners' Capital [Abstract]
Statement of Partners' Capital [Abstract]
Equity Component [Domain]
Equity Component [Domain]
Document Period End Date
Document Period End Date
Estimated fair value of debt and preferred equity investments, high end of range
Mortgage Loans on Real Estate Fair Value, High End of Range
Represents the high end of the range of estimated fair value for investments in mortgage loans on real estate.
SUMMIT
SUMMIT [Member]
SUMMIT
Other investments
Payments For (Proceeds From) Other Investments
Payments For (Proceeds) Other Investments
Commercial mortgage investment (in Percent)
Financing Receivable Excluding Accrued Interest Allowance For Credit Loss, Commercial Mortgage Investment Percentage
Financing Receivable Excluding Accrued Interest Allowance For Credit Loss, Commercial Mortgage Investment Percentage
June 2027
Interest Rate Swap Expiring in June 2027, 1 [Member]
Interest Rate Swap Expiring in June 2027, 1
Awards Close in Time to MNPI Disclosures, Table
Awards Close in Time to MNPI Disclosures [Table Text Block]
Fair value of derivatives in a net liability position
Derivative, Net Liability Position, Aggregate Fair Value
Building & Improvements
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition, Building and Improvements
Remaining weighted average contractual life of the options exercisable (in years)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term
1515 Broadway
Broadway, 1515 [Member]
Represents the information pertaining to 1515 Broadway, a property owned by the entity.
Lease liability - operating leases
Increase (Decrease) in Operating Lease Liability
Total equity
Beginning balance
Ending balance
Equity
Equity, Including Portion Attributable to Noncontrolling Interest
Amortization of discount on assumed debt
Amortization of Debt Discount (Premium)
Debt and preferred equity investments, net of discounts and deferred origination fees of $14 and $1,618 and allowances of $454 and $13,520 in 2025 and 2024, respectively
Debt and preferred equity investments
Mortgage Loans on Real Estate, Commercial and Consumer, Net
Document Type
Document Type
Level 3
Fair Value, Inputs, Level 3 [Member]
315 West 33rd Street
315 West 33rd Street [Member]
315 West 33rd Street
Name
Outstanding Recovery, Individual Name
Additional paid-in-capital
Additional Paid in Capital
Product and Service [Axis]
Product and Service [Axis]
1552 Broadway
1552 Broadway [Member]
1552 Broadway
Amount representing interest
Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount
1552-1560 Broadway
Broadway 1552 to 1560 [Member]
Represents the information pertaining to 1552-1560 Broadway, a joint venture property of the entity.
Number of tenants (tenants)
Number of Tenants
Represents the number of tenants to whom the facility is leased.
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Variable lease payments
Operating Lease, Variable Lease Income
Period from cessation of major construction activity to completion of construction project, maximum
Period from Cessation of Major Construction Activity to Completion of Construction Project, Maximum
Represents the maximum period of time from the cessation of major construction activity to the point at which the construction project is considered substantially completed and held available for occupancy and the capitalization of costs is ceased.
Lapsed or cancelled (in dollars per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price
Stock repurchase program, authorized amount
Share Repurchase Program, Authorized, Amount
Equity in net gain (loss) on sale of interest in unconsolidated joint venture/real estate
Equity in net (gain) loss on sale of interest in unconsolidated joint venture/real estate
Gain (Loss) on Sale
Equity Method Investment, Realized Gain (Loss) on Disposal
Strike Rate
Strike Rate
Derivative, Fixed Interest Rate
Basic earnings (loss) per unit (in dollars per share)
Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic, Net of Tax
Aggregate Erroneous Compensation Amount
Aggregate Erroneous Compensation Amount
Disposal Group Name [Axis]
Disposal Group Name [Axis]
Other plans
Other Pension, Postretirement and Supplemental Plans [Member]
Annualized Rent
Annualized Rent [Member]
Annualized rent, when it serves as a benchmark in a concentration of risk calculation.
Tax withholdings related to restricted share awards
Payment, Tax Withholding, Share-Based Payment Arrangement
Peer Group Issuers, Footnote
Peer Group Issuers, Footnote [Text Block]
Net (loss) income attributable to SL Green common stockholders
(Loss) income attributable to SL Green common stockholders
Net Income (Loss) Available to Common Stockholders, Basic
In Place Leases
In Place Leases [Member]
Represents information pertaining to in-place leases.
Other comprehensive income (loss)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Proceeds from sale of property
Proceeds from Sale of Real Estate
Mezzanine Loan Due June 2024
Mezzanine Loan Due January 2025 -1 [Member]
Mezzanine Loan Due January 2025 -1
Schedule of Effect of Derivative Financial Instruments on Consolidated Statements of Income
Derivative Instruments, Gain (Loss) [Table Text Block]
11 Madison Avenue
11 Madison Avenue [Member]
11 Madison Avenue
Level 1
Fair Value, Inputs, Level 1 [Member]
Beginning balance (in shares)
Ending balance (in shares)
Shares, outstanding (in shares)
Units, outstanding (in units)
Shares, Outstanding
Revolving credit facility, net
Outstanding under line of credit facility
Long-Term Line of Credit
Related Party Transaction [Table]
Related Party Transaction [Table]
Diluted earnings (loss) per share (in dollars per share)
Earnings Per Share, Diluted
2030
Lessor, Operating Lease, Payment to be Received, Year Five
Identified intangible liabilities (included in deferred revenue):
Finite Lived Intangible Liabilities [Abstract]
-- None. No documentation exists for this element. --
Total capital
Beginning balance
Ending balance
Partners' Capital, Including Portion Attributable to Noncontrolling Interest
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Noncontrolling interests in the Operating Partnership
Net income (loss)
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable
Net equity investment in VIEs in which the entity is not primary beneficiary
Variable Interest Entity Not Primary Beneficiary, Investment
Represents the amount of equity investment in variable interest entities (VIEs) in which the entity is not a primary beneficiary.
Number of shares issued (in shares)
Sale of Stock, Number of Shares Issued in Transaction
Dividends [Axis]
Dividends [Axis]
Ownership percentage deconsolidated
Equity Method Investment, Ownership Percentage, Deconsolidated
Equity Method Investment, Ownership Percentage, Deconsolidated
DRSPP proceeds
Stock Issued During Period, Value, Dividend Reinvestment Plan
Dividend Reinvestment and Stock Purchase Plan (DRIP)
Dividend Reinvestment and Stock Purchase Plan [Member]
Represents the dividend reinvestment and stock purchase plan of the entity.
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Consolidation Items [Domain]
Consolidation Items [Domain]
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]
Investments, Debt and Equity Securities [Abstract]
Investments, Debt and Equity Securities [Abstract]
Auditor Location
Auditor Location
Senior Financing
Mortgage Loans on Real Estate, Senior Financing
Mortgage Loans on Real Estate, Senior Financing
2029
Below Market Lease, Amortization Income, Year Four
Capital Gains 2023 Dividend
O 2023 A Capital Gains Dividends [Member]
O 2023 A Capital Gains Dividends
Investments in Unconsolidated Joint Ventures
Equity Method Investments and Joint Ventures Disclosure [Text Block]
Deferred Stock Compensation Plan for Directors
Deferred Stock Compensation Plan for Directors [Member]
Represents the Deferred Stock Compensation Plan for Directors of the entity.
Retirements/disposals/deconsolidation
Real Estate Cost of Real Estate Sold Retired or Deconsolidated
The carrying amount of real estate sold, retired or deconsolidated during the period.
Israeli Institutional Investor
Israeli Institutional Investor [Member]
Israeli Institutional Investor
Noncontrolling Interest [Abstract]
Noncontrolling Interest [Abstract]
Amount discounted using incremental borrowing rate
Lessee, Operating Lease, Liability, Undiscounted Excess Amount
Proceeds from sale of equity marketable securities
Proceeds from Sale of Equity Securities, FV-NI
Deferred compensation plan and stock awards, net of forfeitures and tax withholdings
Deferred Compensation Plan and Stock Award, Net
Value of stock issued during the period from a deferred compensation plan and stock award, net.
Debt and Preferred Equity Investments
Debt And Preferred Equity Investments [Policy Text Block]
Debt And Preferred Equity Investments [Policy Text Block]
Deferred revenue
Increase (Decrease) in Deferred Liabilities
Private Investor
Private Investors
Private Investors [Member]
Private Investors
Estimated average lease term (in years)
Operating Leases, Estimated Average Lease Term
Represents the estimated average term of the operating leases.
Preferred units, shares issued (in shares)
Number of preferred units issued (in shares)
Temporary Equity, Shares Issued
2027
Finite-Lived Intangible Asset, Expected Amortization, Year Two
Repayments or redemption of debt and preferred equity investments
Repayments Or Redemption Of Debt And Preferred Equity Investments
Repayments Or Redemption Of Debt And Preferred Equity Investments
Unpaid Principal Balance
Long-Term Debt, Gross
Granted (in dollars per share)
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price
Entity Well-known Seasoned Issuer
Entity Well-known Seasoned Issuer
Real estate fund investments, number of one year periods
Investment Company, Debt Fund Investments, Number Of One Year Periods
Investment Company, Debt Fund Investments, Number Of One Year Periods
Total minimum lease payments
Lessee, Operating Lease, Liability, to be Paid
Allianz Real Estate of America
Allianz Real Estate of America [Member]
Allianz Real Estate of America
Stabilization period
Related Party Transaction, Stabilization Period
Related Party Transaction, Stabilization Period
SL Green Operating Partnership
Subsidiaries
Subsidiaries [Member]
Net change in loan loss reserves
SEC Schedule, 12-29, Real Estate Companies, Investment In Mortgage Loans On Real Estate, Loan Loss Reserve Period Increase (Decrease)
SEC Schedule, 12-29, Real Estate Companies, Investment In Mortgage Loans On Real Estate, Loan Loss Reserve Period Increase (Decrease)
Carrying value at fixed rate
Total
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss
Acquisition of subsidiary interest from noncontrolling interest
Redemption or Purchase of Interests
Redemption or Purchase of Interests
Cash distributions to noncontrolling interests
Distributions
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders
Term Loan A, Maturity March 31, 2023
Term Loan A, Maturity March 31, 2023 [Member]
Term Loan A [Member]
Dividends [Domain]
Dividends [Domain]
Operating Lease, Lease Income
Operating Lease, Lease Income [Table Text Block]
Expiration Date
Trading Arrangement Expiration Date
Accumulated Depreciation
Balance at beginning of year
Balance at end of year
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation
Excess shares outstanding (in shares)
Excess Stock, Shares Outstanding
220 East 42nd Street
220 East 42nd Street [Member]
220 East 42nd Street
2030
Finite-Lived Intangible Asset, Expected Amortization, Year Five
Amount of related party transaction
Related Party Transaction, Amounts of Transaction
1515 Broadway
1515 Broadway [Member]
1515 Broadway
Total joint venture mortgages and other loans payable, net
Secured Debt and Other Loans, Payable, Net
Secured Debt and Other Loans, Payable, Net
Schedule of General Information on Joint Ventures and Investments in Unconsolidated Joint Ventures Sold
Equity Method Investments [Table Text Block]
Numerator
Numerator
Net Income (Loss) Attributable to Parent [Abstract]
Compensation Actually Paid vs. Net Income
Compensation Actually Paid vs. Net Income [Text Block]
Tenant and other receivables
Increase (Decrease) in Accounts Receivable
Preferred Equity
Preferred Equity [Member]
Preferred Equity [Member]
Construction Loans
Construction Loans [Member]
Series A Preferred Units
Series A Preferred Stock
Series A Preferred Stock [Member]
Conversion of partner loan
Noncash Repayment Of Financing Receivable, Conversion Of Partner Loan
Noncash Repayment Of Financing Receivable, Conversion Of Partner Loan
Entity Current Reporting Status
Entity Current Reporting Status
Financial Instruments: Derivatives and Hedging
Derivative [Line Items]
Financing lease costs, net
Finance Lease Cost
Finance Lease Cost
Awards Close in Time to MNPI Disclosures
Awards Close in Time to MNPI Disclosures [Table]
Common units redemption, period of restriction
Common Units Redemption, Period Of Restriction
Common Units Redemption, Period Of Restriction
Consolidated Entities [Domain]
Consolidated Entities [Domain]
Financial Instrument [Axis]
Financial Instrument [Axis]
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract]
Statement of Financial Position [Abstract]
Statement of Financial Position [Abstract]
Executive Category:
Executive Category [Axis]
Granted (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures
Distributions to noncontrolling interests in the Operating Partnership
Distribution to Noncontrolling Interest Operating Partnership
The cash outflow for distributions to partners in a partnership.
Balance at beginning of year
Balance at end of period
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate
Noncontrolling interests in other partnerships
Partners' Capital Attributable to Noncontrolling Interest
Interest expense before capitalized interest
Interest Expense, Operating and Nonoperating
Current Fiscal Year End Date
Current Fiscal Year End Date
Balance at beginning of year
Balance at end of year
Noncontrolling Interest in Preferred Unit Holders
Expected life of option (in years)
Expected life (in years)
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term
Finite-Lived Intangible Assets, Major Class Name [Domain]
Finite-Lived Intangible Assets, Major Class Name [Domain]
Below Market Leases
Leases, Below Market [Member]
Leases, Below Market [Member]
Real Estate Property, Ownership [Table]
Real Estate Property, Ownership [Table]
Reclassification
Real Estate Investment in Real Estate, Reclassification
Real Estate Investment in Real Estate, Reclassification
Equity Awards Adjustments, Excluding Value Reported in Compensation Table
Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member]
Schedule of Estimated Annual Amortization of Acquired Above-market Leases, Net of Acquired Below-market Leases
Schedule of Acquired above Market and below Market Leases, Future Amortization Expense [Table Text Block]
Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for acquired below-market leases, net of acquired above-market leases.
Debt and preferred equity investments, net
Debt Securities, Trading, and Equity Securities, FV-NI, Cost
Interest Rate Contract
Interest Rate Contract [Member]
Contributions from noncontrolling interests in other partnerships
Proceeds from Noncontrolling Interests in Other Partnerships
The cash inflow from the capital received in cash from a partner in a consolidated partnership during the period.
Noncontrolling Interests on the Company's Consolidated Financial Statements
Noncontrolling Interest Disclosure [Text Block]
115 Spring Street
115 Spring Street [Member]
115 Spring Street
Schedule of Mortgage Notes and Other Loans Payable Collateralized by the Respective Joint Venture Properties and Assignment of Leases
Schedule of Mortgage and Other Loans Payable on Joint Venture Properties [Table Text Block]
Tabular disclosure of the information pertaining to mortgage and other loans payable on joint venture properties of the entity.
Distributions of cumulative earnings from unconsolidated joint ventures
Proceeds from Equity Method Investment, Distribution
Proceeds from sale or redemption of marketable securities
Proceeds from Sale and Maturity of Marketable Securities
Landmark Square
Landmark Square [Member]
Represents the information pertaining to Landmark Square, a property owned by the entity.
Common stock shares excluded from the diluted shares outstanding (in shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Denominator
Denominator
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Debt disclosures by scheduled maturity date
Debt Instrument, Information by Scheduled Maturity Date of Debt [Abstract]
-- None. No documentation exists for this element. --
Contributions of net proceeds from sale of preferred stock
Proceeds from Issuance of Preferred Stock and Preference Stock
New York State Teacher's Retirement System
New York State Teacher's Retirement System [Member]
New York State Teacher's Retirement System
2027
Long-Term Debt, Maturity, Year Two
Debt Investments Held [Abstract]
Debt Investments Held [Abstract]
Debt Investments Held [Abstract]
Other Commitments [Table]
Other Commitments [Table]
June 2026
Interest Rate Cap Expiring June 2026 [Member]
Interest Rate Cap Expiring June 2026
Net cash provided by (used in) financing activities
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation
Future funding obligations
Loans and Leases Receivable, Funding Obligation
Loans and Leases Receivable, Funding Obligation
Measure:
Measure [Axis]
Operating lease costs capitalized
Operating Lease, Cost, Capitalized
Operating Lease, Cost, Capitalized
Repayment or redemption of debt fund investments
Repayment Or Redemption Of Debt Fund Investments
Repayment Or Redemption Of Debt Fund Investments
Servicing Asset and Servicing Liability, Risk Mitigation [Table]
Servicing Asset and Servicing Liability, Risk Mitigation [Table]
Net income (loss)
Profit (Loss) Less Minority Interest in Net Income (Loss) Operating Partnerships
Net income including minority interest in partnerships.
Redemption of OP units
Payments for Repurchase of Other Equity
717 Fifth Avenue
Fifth Avenue, 717 [Member]
Represents the information pertaining to 717 Fifth Avenue, a joint venture property of the entity.
Property, Plant and Equipment, Type [Domain]
Long-Lived Tangible Asset [Domain]
Deferred rents receivable
Deferred Rent Receivables, Net
Schedule III - Real Estate and Accumulated Depreciation
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Text Block]
Statement of Financial Position Location, Activity, Accrual [Domain]
Statement of Financial Position Location, Activity, Accrual [Domain]
Transaction related costs
Business Combination, Acquisition Related Costs, Adjustment
Business Combination, Acquisition Related Costs, Adjustment
Senior financing
Mortgage Loans on Real Estate, Senior Debt on Investment
Amount as of the balance sheet date of debt which holds a position senior to the entity's investment in a mortgage loan on real estate.
Origination or purchase of debt fund investments
Origination or Purchase Of Debt Fund Investments
Origination or Purchase Of Debt Fund Investments
Pay vs Performance Disclosure, Table
Pay vs Performance [Table Text Block]
Gross Amount at Which Carried at Close of Period
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross [Abstract]
Forgone Recovery due to Violation of Home Country Law, Amount
Forgone Recovery due to Violation of Home Country Law, Amount
Risk-free interest rate (as a percent)
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Amortization of deferred financing costs
Amortization of deferred financing costs
Amortization of Debt Issuance Costs
Entity Tax Identification Number
Entity Tax Identification Number
Sale of preferred equity investment
Proceeds from Sale of Equity Method Investments
Final closing term
Investment Company, Debt Fund Investments, Final Closing Term
Investment Company, Debt Fund Investments, Final Closing Term
Initial allowance for credit losses on loans purchased with credit deterioration ("PCD")
Financing Receivable, Excluding Accrued Interest, Initial Credit Loss Expense (Reversal)
Financing Receivable, Excluding Accrued Interest, Initial Credit Loss Expense (Reversal)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Axis]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Axis]
Number of shares to be received on redemption of one unit of limited partnership interests (shares)
Number of Shares on Redemption of One Unit of Partnership Interest
Represents the number of shares of the common stock of the entity, which the limited partner of the operating partnership is entitled to receive on redemption of one unit of interest in the partnership.
Deconsolidation of a subsidiary
Deconsolidation Real Estate Investments
Represents the change in the carrying value of real estate investments resulting from deconsolidation.
Balance at beginning of year (in dollars per share)
Balance at end of period (in dollars per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Unrealized loss
Debt Securities, Available-for-Sale, Unrealized Loss
Common stock, shares issued (in shares)
Common Stock, Shares, Issued
Equity
Stockholders Equity Including Portion Attributable to Noncontrolling Interest in Other Partnership [Abstract]
-- None. No documentation exists for this element. --
Operating lease, weighted average remaining lease term
Operating Lease, Weighted Average Remaining Lease Term
Gains (losses) from changes in fair value
Accumulated Other Comprehensive Income (Loss), Gain (Loss) from Changes in Fair Value
Accumulated Other Comprehensive Income (Loss), Gain (Loss) from Changes in Fair Value
2029
Long-Term Debt, Maturity, Year Four
Commercial mortgage-backed securities - available-for-sale
Commercial Mortgage-Backed Securities [Member]
Building (fee ownership)
Building Fee Ownership [Member]
Represents information pertaining to long-lived, depreciable structures held for productive use, including office, production, storage and distribution facilities, on a fee ownership basis.
Schedule of Non-controlling Interest
Redeemable Noncontrolling Interest [Table Text Block]
September 2028
Interest Rate Swap Expiring September 2028 [Member]
Interest Rate Swap Expiring September 2028
Effect of Dilutive Securities:
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Maximum percentage of the annual retainer fee, chairman fees and meeting fees that may be deferred by non-employee directors (percent)
Deferred Compensation Arrangement with Individual Maximum Percentage of the Compensation that May be Deferred
Represents the maximum percentage of the compensation that may be deferred by employees of the entity under deferred compensation plans.
Deferred financing costs, net of amortization
Secured Debt, Deferred Finance Costs, Net
Secured Debt, Deferred Finance Costs, Net
Debt fund investments, contributed amount
Investment Company, Debt Fund Investments, Contributed Amount
Investment Company, Debt Fund Investments, Contributed Amount
Reclassification
Real Estate Companies, Investment in Real Estate, Reclassification
Real Estate Companies, Investment in Real Estate, Reclassification
Entity Public Float
Entity Public Float
Loss from debt fund investments, net
Income (Loss) From Debt Fund Investments
Income (Loss) From Debt Fund Investments
Trading Arrangement:
Trading Arrangement [Axis]
Total Shareholder Return Amount
Total Shareholder Return Amount
Rental revenue, net
Total rental revenue
Operating Lease, Lease Income
Real Estate, Type of Property [Axis]
Real Estate, Type of Property [Axis]
Security Exchange Name
Security Exchange Name
420 Lexington Avenue
420 Lexington Avenue [Member]
420 Lexington Avenue
2027
Lessor, Operating Lease, Payment to be Received, Year Two
Equity method investments with negative book value
Equity Method Investments With Negative Book Value
Equity Method Investments With Negative Book Value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Retail building
Retail Site [Member]
Cost Capitalized Subsequent To Acquisition
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition [Abstract]
-- None. No documentation exists for this element. --
Maximum facility capacity
Credit facility, maximum borrowing capacity
Line of Credit Facility, Maximum Borrowing Capacity
Perpetual preferred stock dividends
Perpetual preferred stock dividends
Perpetual preferred unit dividends
Dividends, Preferred Stock
DRSPP proceeds (in shares)
DRSPP proceeds (in units)
Stock Issued During Period, Shares, Dividend Reinvestment Plan
Number of shares purchased (in shares)
Stock Repurchased During Period, Shares
Accrued interest payable
Accrued Interest Payable And Other
Accrued Interest Payable And Other
SUMMIT One Vanderbilt
SUMMIT One Vanderbilt [Member]
SUMMIT One Vanderbilt
Economic Interest (as a percent)
Equity Method Investment, Economic Interest Percentage
The percentage of economic interest in the investee accounted for under the equity method of accounting.
800 Third Avenue Joint Venture
800 Third Avenue Joint Venture [Member]
800 Third Avenue Joint Venture
Statement [Line Items]
Statement [Line Items]
Rule 10b5-1 Arrangement Adopted
Rule 10b5-1 Arrangement Adopted [Flag]
Other
Other Property Investments [Member]
Other Property Investments
Cash and cash equivalents
Cash and restricted cash
Cash and Cash Equivalent
Variable rate debt
Long-Term Debt, Percentage Bearing Variable Interest, Amount
Common Stock
Common Stock
Common Stock [Member]
Vested during the period (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period
19 East 65th Street
19 East 65th Street [Member]
19 East 65th Street
Employee-related liabilities
Employee-related Liabilities
Real estate loans held by consolidated securitization vehicles in excess of senior obligations of consolidated securitization vehicles
Loan, Held-in-Portfolio, Principal Outstanding
Development/Redevelopment
Development Properties [Member]
Represents the development properties owned by the entity.
Less: accumulated depreciation
Accumulated depreciation
Accumulated depreciation
Real Estate Investment Property, Accumulated Depreciation
Net increase (decrease) in cash, cash equivalents, and restricted cash
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation
Unrealized gains on investments
Unrealized Gain (Loss) on Investments
Dividends per share paid (in dollars per share)
Common Stock, Dividends, Per Share, Cash Paid
A fund managed by Meritz Alternative Investment Management
A Fund Managed By Meritz Alternative Investment Management [Member]
A Fund Managed By Meritz Alternative Investment Management
Significant Accounting Policies
Significant Accounting Policies [Text Block]
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Thereafter
Lessee, Operating Lease, Liability, to be Paid, after Year Five
Wharton Properties
Wharton Properties [Member]
Wharton Properties
Workforce Concentration
Labor Force Concentration Risk [Member]
Loan interest income
Financing Receivable, Nonaccrual, Interest Income
Partial loan repayment
Proceeds from Collection of Finance Receivables
Real Estate, Property Type [Domain]
Real Estate [Domain]
Deferred Lease Costs
Deferred Lease Costs [Policy Text Block]
Disclosure of accounting policy for deferral and amortization of deferred lease costs.
Retail
Retail Properties [Member]
Represents information pertaining to retail properties owned by the entity.
Deferred loan costs
Payments of Financing Costs
Building leasehold and improvements
Building Leasehold Improvements, Gross
Carrying amount at the balance sheet date of long-lived, depreciable asset that is an addition or improvement to assets held under lease arrangement as well as the initial investment in a leasehold interest.
Authorized capital stock (in shares)
Total Shares Authorized
The maximum number of total capital shares permitted to be issued by an entity's charter and bylaws.
Equity in net loss from unconsolidated joint ventures
Equity in net loss from unconsolidated joint ventures
Company's equity in net (loss) income from unconsolidated joint ventures
Equity in net loss from unconsolidated joint ventures
Income (Loss) from Equity Method Investments
Leases [Abstract]
Leases [Abstract]
2029
Lessor, Operating Lease, Payment to be Received, Year Four
Schedule of Carrying Value of Debt and Preferred Equity Investment Portfolio by Year of Origination and Risk Rating
Schedule Of Investment In Financing Receivables And Risk Rating [Table Text Block]
Schedule Of Investment In Financing Receivables And Risk Rating
Land
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Land, Amount
650 Fifth Avenue
Fifth Avenue, 650 [Member]
650 Fifth Avenue [Member]
Schedule of Properties Sold
Disposal Groups, Including Discontinued Operations [Table Text Block]
Real Estate by Location [Domain]
Real Estate by Location [Domain]
Identifies real estate properties of the entity by location.
315 West 33rd Street
315 W 33rd St [Member]
315 W 33rd St
The Debt Investment Fund
The Debt Investment Fund [Member]
The Debt Investment Fund
Trading Arrangements, by Individual
Trading Arrangements, by Individual [Table]
719 Seventh Avenue
Seven One Nine Seventh Avenue [Member]
Seven One Nine Seventh Avenue [Member]
Basic earnings (loss) per share (in dollars per share)
Earnings Per Share, Basic
Deconsolidation of subsidiary debt
Deconsolidation Of Subsidiary Mortgage
Deconsolidation Of Subsidiary Mortgage
Other comprehensive (loss) income
Other Comprehensive Income (Loss), Net of Tax
Schedule Of Selected Results Of Operations And Selected Asset Information
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Balance at beginning of year
Balance at end of year
Noncontrolling Interest in Operating Partnerships
Contingently issuable units (in shares)
Incremental Common Units Attributable to Dilutive Effect of Nonvested Shares with Forfeitable Dividends
Incremental Common Units Attributable to Dilutive Effect of Nonvested Shares with Forfeitable Dividends
2028
Finance Lease, Liability, to be Paid, Year Three
Total joint venture mortgages and other loans payable
Secured Debt and Other Loans, Payable
Represents the carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations and other loans payable.
Proceeds from divestiture of interest in joint venture
Proceeds from Divestiture of Interest in Joint Venture
Writeoffs of the allowance
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff
Acquisition of subsidiary interest from noncontrolling interest
Acquisition Of Subsidiary Interest From Noncontrolling Interest
Acquisition Of Subsidiary Interest From Noncontrolling Interest
Award Timing MNPI Disclosure
Award Timing MNPI Disclosure [Text Block]
January 2026
Interest Rate Cap Expiring in January 2026 [Member]
Interest Rate Cap Expiring in January 2026
Service Corporation
Variable Interest Entity, Primary Beneficiary [Member]
Restricted Cash
Restricted Cash [Policy Text Block]
Restricted Cash
Interest expense
Interest Income (Expense), Operating [Abstract]
Revolving Credit Facility
Credit Facility 2012 [Member]
Represents information pertaining to 2012 Credit Facility.
Investments in unconsolidated joint ventures
Cash consideration
Payments to Acquire Equity Method Investments
Compensation expense
Compensation expense recorded
Share-Based Payment Arrangement, Expense
Distributions to debt fund investments
Distributions To Debt Fund Investments
Distributions To Debt Fund Investments
Mortgages and other loans payable, net
Real estate debt
Total mortgages and other loans payable, net
Secured Debt
Total fixed rate debt
Secured Debt, Bearing Fixed Interest, Amount
The portion of the carrying amount of long-term secured loans outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.
Total liabilities and equity/capital
Liabilities and Equity
Basic (Loss) Earnings:
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted [Abstract]
Options Outstanding
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Axis]
625 Madison Avenue
Madison Avenue, 625 [Member]
Represents the information pertaining to 625 Madison Avenue, a property owned by the entity.
O 2024 A Dividends
O 2024 A Dividends [Member]
O 2024 A Dividends
Equity Method Investment [Table]
Equity Method Investment [Table]
Origination of debt and preferred equity investments
Origination Of Debt And Preferred Equity Investments
Origination Of Debt And Preferred Equity Investments
Accounting Policies [Abstract]
Accounting Policies [Abstract]
Series I Preferred Units, $25.00 liquidation preference, 9,200 issued and outstanding at both December 31, 2025 and 2024
Preferred Units, Preferred Partners' Capital Accounts
Schedule Of Future Minimum Rental Payments For Operating Leases
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]
Concentration Risk Type [Domain]
Concentration Risk Type [Domain]
Repayments of mortgages and other loans payable
Repayments of Secured Debt
Treasury Stock
Treasury Stock, Common [Member]
Fair value of restricted stock vested during the period
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value
Private Investor / Wharton Properties
Private Investor / Wharton Properties [Member]
Private Investor / Wharton Properties
2025
Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year
Dividends Payable [Line Items]
Dividends Payable [Line Items]
Pay vs Performance Disclosure [Line Items]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Domain]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Loan Type [Domain]
Lease liability - operating leases
Lease liabilities
Operating Lease, Liability
Total payments to be received
Lessor, Operating Lease, Payment to be Received
February 2027
Interest Rate Swap Expiring in February 2027, 1 [Member]
Interest Rate Swap Expiring in February 2027, 1
Financing Receivables, Equal to Greater than 90 Days Past Due
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Preferred stock, liquidation preference (in dollars per share)
Perpetual Preferred stock, liquidation preference (in dollars per share)
Preferred Stock, Liquidation Preference Per Share
Liabilities
Liabilities [Abstract]
Property Acquisitions and Consolidations
Business Combination [Text Block]
February 2026
Interest Rate Swap Expiring February 2026 [Member]
Interest Rate Swap Expiring February 2026
Depreciation and amortization
Depreciation and amortization
Depreciation, Depletion and Amortization, Nonproduction
Auditor [Line Items]
Auditor [Line Items]
Investments difference between carrying amount and underlying equity
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity
Changes in real estate
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Giorgio Armani Residences at 760 Madison Avenue (6 Condominium Units)
Giorgio Armani Residences at 760 Madison Avenue (6 Condominium Units) [Member]
Giorgio Armani Residences at 760 Madison Avenue (6 Condominium Units)
2023
Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year
Statement of Cash Flows [Abstract]
Statement of Cash Flows [Abstract]
Company Selected Measure Amount
Company Selected Measure Amount
2028
Lessee, Operating Lease, Liability, to be Paid, Year Three
Andrew Mathias
Andrew Mathias [Member]
Andrew Mathias
Comprehensive income attributable to SL Green/SLGOP
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Security deposits
Security Deposit Liability
Disposal Group Name [Domain]
Disposal Group Name [Domain]
Name
Measure Name
Rollforward analysis of the activity relating to the noncontrolling interests in the operating partnership
Equity, Attributable to Noncontrolling Interest [Roll Forward]
Discontinued Operation, Gain (Loss) On Disposal, Statement Of Income Or Comprehensive Income, Extensible Enumeration, Not Disclosed Flag
Discontinued Operation, Gain (Loss) On Disposal, Statement Of Income Or Comprehensive Income, Extensible Enumeration, Not Disclosed Flag
Discontinued Operation, Gain (Loss) On Disposal, Statement Of Income Or Comprehensive Income, Extensible Enumeration, Not Disclosed Flag
Class of Stock [Line Items]
Class of Stock [Line Items]
Partner Capital Components [Domain]
Partner Capital Components [Domain]
280 Park Avenue
Park Avenue, 280 [Member]
Represents the information pertaining to 280 Park Avenue, a joint venture property of the entity.
Park Avenue 500
Park Avenue 500 [Member]
Park Avenue 500
Long-term debt
Long-Term Debt
Legal Entity [Axis]
Legal Entity [Axis]
Tenant and other receivables
Tenant and other receivables, related party receivables, and deferred rents receivable
Accounts and Financing Receivable, after Allowance for Credit Loss
Noncontrolling interests in other partnerships
Nonredeemable Noncontrolling Interest
Total assets
Assets
2026
Finite-Lived Intangible Asset, Expected Amortization, Year One
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Credit Quality Indicator [Line Items]
Real Estate [Table]
Real Estate [Table]
Total SLGOP partners' capital
Partners' Capital
Real Estate Segment
Real Estate Segment [Member]
Represents the information pertaining to the reportable segment of the entity, Real Estate Segment.
Ownership interest disposed (in percent)
Disposal Group, Including Discontinued Operation, Ownership Interest Disposed
Disposal Group, Including Discontinued Operation, Ownership Interest Disposed
Income Taxes
Income Tax, Policy [Policy Text Block]
Operating Activities
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]
Acquisition deposits and deferred purchase price
Payments For (Proceeds From) Acquisition Deposits And Deferred Purchase Price
Payments For (Proceeds From) Acquisition Deposits And Deferred Purchase Price
Depreciation for year
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation, Depreciation Expense
Concentration Risk Type [Axis]
Concentration Risk Type [Axis]
Total commercial real estate properties, at cost
Real Estate Investment Property, at Cost
Cash distributions declared
Partners' Capital Account, Distributions
Partners' Interest
General Partner [Member]
2029
Finite-Lived Intangible Asset, Expected Amortization, Year Four
2026
Finance Lease, Liability, to be Paid, Year One
Cash distribution declared, per common share (in dollars per share)
Cash distribution declared, per common share (in dollars per unit)
Common Stock, Dividends, Per Share, Declared
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Recognition of lease liabilities arising from obtaining right-of-use assets
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability
Dividends paid on preferred units
Noncontrolling Interest, Decrease From Distribution On Preferred Units
Noncontrolling Interest, Decrease From Distribution On Preferred Units
Gross asset valuation
Business Combination, Recognized Asset Acquired, Asset
Level 2
Fair Value, Inputs, Level 2 [Member]
Office
Office Properties [Member]
Represents the investment in office properties owned by the entity.
Document Financial Statement Error Correction Flag
Document Financial Statement Error Correction [Flag]
Cash and restricted cash derecognized from disposition and deconsolidation of real estate investment
Proceeds From Deconsolidation Of Real Estate Investment
Proceeds From Deconsolidation Of Real Estate Investment
Investments in unconsolidated joint ventures
Company's investments in unconsolidated joint ventures
Equity Method Investments
Insider Trading Policies and Procedures Not Adopted
Insider Trading Policies and Procedures Not Adopted [Text Block]
February 2026
Interest Rate Swap Expiring February 2026, 1 [Member]
Interest Rate Swap Expiring February 2026, 1
Business Combination [Domain]
Business Combination [Domain]
Repayment of senior obligations of consolidated securitization vehicles
Repayment of Loans Receivable
Repayment of Loans Receivable
Related party
Related Party [Member]
Mortgages and Other Loans Payable [Line Items]
Mortgages and Other Loans Payable [Line Items]
Mortgages and Other Loans Payable
Sales-type Lease, Lease Income
Sales-type Lease, Lease Income [Table Text Block]
Plan Name [Axis]
Plan Name [Axis]
Number of extensions
Line Of Credit Facility, Number Of Extensions
Line Of Credit Facility, Number Of Extensions
2030
Sales-Type and Direct Financing Leases, Payment to be Received, Year Five
Series X
Series X Preferred Stock [Member]
Series X Preferred Stock
Document Information [Table]
Document Information [Table]
PEO
PEO [Member]
Proceeds from mortgages and other loans payable
Proceeds from Issuance of Secured Debt
(Loss) income attributable to SLGOP common unitholders
Net Income (Loss) Allocated to, Common Unitholders, Including Antidilutive Effect
Net Income (Loss) Allocated to, Common Unitholders, Including Antidilutive Effect
Total lease payments
Operating Lease Lease Income Fixed And Variable Lease Payments
Operating Lease Lease Income Fixed And Variable Lease Payments
11 Madison Avenue
11 Madison Ave [Member]
11 Madison Ave [Member]
Trust Preferred Securities
Junior Subordinated Debt [Member]
Nonaccrual allowance writeoff
Financing Receivable, Nonaccrual, Excluding Accrued Interest, Allowance For Credit Loss, Writeoff
Financing Receivable, Nonaccrual, Excluding Accrued Interest, Allowance For Credit Loss, Writeoff
760 Madison Avenue
760 Madison Avenue [Member]
760 Madison Avenue
Changes in operating assets and liabilities:
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract]
Depreciable real estate reserves in unconsolidated joint venture
Depreciable Real Estate Reserves in Unconsolidated Joint Venture
Depreciable Real Estate Reserves in Unconsolidated Joint Venture
Expected stock price volatility (as a percent)
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate
Retained Deficit
Retained Earnings [Member]
Share-based Payment Arrangement [Abstract]
Share-Based Payment Arrangement [Abstract]
Cash, cash equivalents, and restricted cash at beginning of year
Cash, cash equivalents, and restricted cash at end of year
Total cash, cash equivalents, and restricted cash
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation
Combined statements of income for the unconsolidated joint ventures
Income Statement [Abstract]
Annual dividends on preferred units (in dollars per share)
Preferred Stock, Dividends, Per Share, Cash Paid
Interest Expense
Interest Expense [Member]
Product and Service [Domain]
Product and Service [Domain]
Above Market Leases
Above Market Leases [Member]
Customer Concentration
Customer Concentration Risk [Member]
One Madison Avenue
One Madison Avenue [Member]
One Madison Avenue
2027
Sales-Type and Direct Financing Leases, Payment to be Received, Year Two
Investment in joint venture, partners' ownership percentage
Investment in Joint Venture, Partners' Ownership Percentage
Investment in Joint Venture, Partners' Ownership Percentage
Net (loss) income
Net (loss) income
Net (loss) income
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
2028
Lessor, Operating Lease, Payment to be Received, Year Three
Restatement does not require Recovery
Restatement Does Not Require Recovery [Text Block]
Business Combination [Table]
Business Combination [Table]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Contributions to debt fund investments
Noncontrolling Interest, Increase From Contributions
Noncontrolling Interest, Increase From Contributions
Total minimum lease payments
Sales-Type and Direct Financing Leases, Payment to be Received
January 2026
Interest Rate Cap Expiring in January 2026, 1 [Member]
Interest Rate Cap Expiring in July 2025
Earnings per Unit of the Operating Partnership
Earnings Per Unit, Policy [Policy Text Block]
Earnings Per Unit, Policy [Policy Text Block]
City Area Code
City Area Code
Schedule of Roll Forward of our Total Allowance for Loan Losses
Financing Receivable, Allowance for Credit Loss [Table Text Block]
Award Timing, How MNPI Considered
Award Timing, How MNPI Considered [Text Block]
650 Fifth Avenue
650 Fifth Avenue [Member]
650 Fifth Avenue
Senior obligations of consolidated securitization vehicles
Loan, Securitized or Asset-Backed Financing Arrangement, Principal Outstanding
Effect of Dilutive Securities:
Net Income (Loss), Per Outstanding Limited Partnership Unit, Diluted, Other Disclosure [Abstract]
Real estate loans held by consolidated securitization vehicles in excess of senior obligations of consolidated securitization vehicles
Loans held by Servicing Asset at Fair Value, Net
Loans held by Servicing Asset at Fair Value, Net
Junior subordinated deferrable interest debentures held by trusts that issued trust preferred securities
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust
Investing Activities
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]
Pay vs Performance Disclosure
Pay vs Performance Disclosure [Table]
Proceeds from sale and maturity of held-to-maturity securities
Proceeds from Sale and Maturity of Held-to-Maturity Securities
SUMMIT Operator expenses
Segment Operator Expense
Segment Operator Expense
Interest income from real estate loans held by consolidated securitization vehicles
Interest and Fee Income, Loans, Commercial and Residential, Real Estate
Employer matching contribution, percent of match
Defined Contribution Plan, Employer Matching Contribution, Percent of Match
SL Green Management
SLGreenManagement [Member]
SLGreenManagement [Member]
Related Party Transactions [Abstract]
Related Party Transactions [Abstract]
Equity marketable securities
Equity Securities, FV-NI
Other liabilities
Other Liabilities
Lease, Cost
Lease, Cost [Table Text Block]
Number of investments, fully reserved
Number Of Investments, Fully Reserved
Number Of Investments, Fully Reserved
Basis spread on variable rate
Loans Receivable, Basis Spread on Variable Rate
Schedule of Combined Balance Sheets for the Unconsolidated Joint Ventures
Equity Method Investments, Summarized Financial Information Balance Sheet [Table Text Block]
Disclosure of summarized balance sheet financial information for investments accounted for using the equity method of accounting.
Auditor Name
Auditor Name
Concentration Risk [Table]
Concentration Risk [Table]
Total floating rate debt
Secured Debt, Bearing Variable Interest, Amount
The portion of the carrying amount of long-term secured loans outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.
(Loss) gain on sale of real estate, net
Loss (gain) on sale of real estate, net
Loss on sale of real estate, net
Gains (Losses) on Sales of Investment Real Estate
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
National Pension Service of Korea / Hines Interest LP / Mori Building Co., Ltd
National Pension Service of Korea / Hines Interest LP / Mori Building Co., Ltd
National Pension Service of Korea / Hines Interest LP / Mori Building Co., Ltd [Member]
National Pension Service of Korea / Hines Interest LP / Mori Building Co., Ltd
Supplemental cash flow disclosures:
Supplemental Cash Flow Information [Abstract]
Net operating income from unconsolidated joint ventures
Net Operating Income From Unconsolidated Joint Ventures
Net Operating Income From Unconsolidated Joint Ventures
7 Dey/185 Broadway
7 Dey / 185 Broadway
7 Dey/185 Broadway [Member]
7 Dey/185 Broadway
Other Performance Measure, Amount
Other Performance Measure, Amount
Aggregate cost of land, buildings and improvements before depreciation
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Federal Income Tax Basis
Investment in Marketable Securities
Marketable Securities, Policy [Policy Text Block]
2026
Lessor, Operating Lease, Payment to be Received, Year One
Related Party [Domain]
Related and Nonrelated Parties [Domain]
Senior unsecured notes
Senior Unsecured Notes [Member]
Senior Unsecured Notes [Member]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Fair Value Measurements
Fair Value of Financial Instruments, Policy [Policy Text Block]
Entity [Domain]
Entity [Domain]
Interest payment deferment, number of consecutive quarters
Debt Instrument, Interest Payment Deferment, Number Of Consecutive Quarters
Debt Instrument, Interest Payment Deferment, Number Of Consecutive Quarters
Net cash (used in) provided by investing activities
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation
Number of marketable securities sold
Debt Securities, Available For Sale, Number Of Securities Sold
Debt Securities, Available For Sale, Number Of Securities Sold
Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table
Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member]
Amount of Gain Reclassified from Accumulated Other Comprehensive Income into Income
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net
Interest paid
Interest Paid, Excluding Capitalized Interest, Operating Activity
719 Seventh Avenue
719 Seventh Ave [Member]
719 Seventh Ave
Investment in joint venture
Investment In Joint Venture
Investment In Joint Venture
Document Fiscal Year Focus
Document Fiscal Year Focus
Right-of-use asset - operating leases
Operating Lease, Right-of-Use Asset
Deferred Financing Costs
Deferred Financing Costs [Policy Text Block]
Disclosure of accounting policy for deferral and amortization of deferred financing costs.
Operating lease rent
Operating lease costs, net
Operating Lease, Cost
Mezzanine Loan Due July 2025
Mezzanine Loan Due July 2027 [Member]
Mezzanine Loan Due July 2027
Committed capital
Investment Company, Committed Capital
Carrying Value
Reported Value Measurement [Member]
Plan Name [Domain]
Plan Name [Domain]
2012 Credit Facility
Credit Facility 2017 [Member]
Credit Facility 2017 [Member]
Schedule of Real Estate CMBS Securitization Trusts
Schedule of Fair Value Assumption, Date of Securitization or Asset-Backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Table Text Block]
Weighted average period for recognition of compensation cost related to unvested stock awards (in years)
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition
125 Park Avenue
Park Avenue, 125 [Member]
Represents the information pertaining to 125 Park Avenue, a property owned by the entity.
Equity [Abstract]
Equity [Abstract]
Maximum fungible units that may be granted (in shares)
Share Based Compensation Arrangement by Share Based Payment Award, Number of Fungible Units Authorized
Represents the maximum number of fungible units authorized to be granted by the entity.
Palisades Premier Conference Center
Palisades Premier Conference Center [Member]
Palisades Premier Conference Center
Unsecured term loans, net
Accreted Balance
Senior Notes
Building
Building [Member]
Derivative Instruments
Derivatives, Policy [Policy Text Block]
Segment Information
Segment Reporting Disclosure [Text Block]
Investment in Marketable Securities
Fair Value of Financial Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Commitments [Line Items]
Other Commitments [Line Items]
Increase (Decrease) in Stockholders' Equity
Increase (Decrease) in Partner's Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year
Workforce Subject to Collective-Bargaining Arrangements Expiring within One Year [Member]
10 East 53rd Street
10 East 53rd Street [Member]
10 East 53rd Street
Compensation Actually Paid vs. Total Shareholder Return
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
Income Loss From Equity Method Investments
Income Loss From Equity Method Investments [Member]
Income Loss From Equity Method Investments [Member]
Number of portfolio segments of financial receivables (segment)
Financing Receivable, Portfolio Segments Number
Represents the number of portfolio segments of financing receivables.
Accumulated Other Comprehensive Income
Comprehensive Income (Loss) Note [Text Block]
Weighted Average
Weighted Average [Member]
Fair Value, Recurring and Nonrecurring [Table]
Fair Value, Recurring and Nonrecurring [Table]
7 Landmark Square
Landmark Square, 7 [Member]
Represents the information pertaining to 7 Landmark Square, a property owned by the entity.
Marketing, general and administrative
Marketing, general and administrative
Selling, General and Administrative Expense
Schedule of Accumulated Other Comprehensive Income
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Perpetual Preferred stock, annual dividends per share (in dollars per share)
Preferred Stock, Dividend Rate, Per-Dollar-Amount
Senior obligations of consolidated securitization vehicles
Senior Obligations Of Consolidated Securitization Vehicles [Member]
Senior Obligations Of Consolidated Securitization Vehicles
Depreciation and amortization
Depreciation, Depletion and Amortization
DPE Segment
Debt And Preferred Equity Segment [Member]
Debt And Preferred Equity Segment
Land
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Cost Capitalized Subsequent to Acquisition, Land
Revolving credit facility
Revolving Credit Facility [Member]
Partner Capital Components [Axis]
Partner Capital Components [Axis]
January 2026
Interest Rate Cap Expiring in January 2026, 2 [Member]
Interest Rate Cap Expiring in January 2026, 2
Lease liability - financing leases
Lease liabilities
Finance Lease, Liability
Arrangement Duration
Trading Arrangement Duration
Originations/fundings/accretion
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, New Mortgage Loan
Business Segments [Axis]
Segments [Axis]
Percentage of ownership in SL Green Management LLC owned by operating partnership (percent)
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest
Fair Value [Abstract]
Fair Value [Abstract]
Fair Value
Operating Partnership units redeemable for common shares (in shares)
Incremental Common Shares, Attributable to Redemption of Units to Common Shares
Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of the redemption of units to common shares.
Local Phone Number
Local Phone Number
Additional 402(v) Disclosure
Additional 402(v) Disclosure [Text Block]
Average share price (in dollars per share)
Share Price
Thereafter
Long-Term Debt, Maturity, after Year Five
Share-based Compensation
Share-Based Payment Arrangement [Text Block]
Limited partner interests in SLGOP (4,538 and 4,510 limited partner common units outstanding at December 31, 2025 and 2024, respectively)
Limited Partners' Capital Account
Series F
Series F Preferred Stock [Member]
100 Church Street
Church Street, 100 [Member]
Represents the information pertaining to 100 Church Street, a property owned by the entity.
346 Madison Avenue
346 Madison Avenue
346 Madison Avenue [Member]
346 Madison Avenue
Assets
Assets [Abstract]
Revenue from Contract with Customer, Liability Type Axis [Axis]
Revenue from Contract with Customer, Liability Type Axis [Axis]
Revenue from Contract with Customer, Liability Type Axis
Proceeds from revolving credit facility, term loans and senior unsecured notes
Proceeds from Issuance of Unsecured Debt
Credit Facility [Axis]
Credit Facility [Axis]
Excess stock, shares authorized (shares)
Excess Stock, Shares Authorized
Underlying Security Market Price Change
Underlying Security Market Price Change, Percent
January 2025 Mortgage
January 2025 Mortgage [Member]
January 2025 Mortgage
Debt Instrument [Axis]
Debt Instrument [Axis]
Operating Partnership
Operating Partnership [Member]
Operating Partnership
SUMMIT Segment
SUMMIT Segment [Member]
SUMMIT Segment
Mezzanine Loan Due January 2026,1
Mezzanine Loan Due January 2026,1 [Member]
Mezzanine Loan Due January 2026,1
Benefit Plans
Retirement Benefits [Text Block]
Fair Value Measurements
Fair Value Disclosures [Text Block]
Business Combination [Line Items]
Business Combination [Line Items]
Gain (loss) on early extinguishment of debt
Loss (gain) on early extinguishment of debt
Gain on early extinguishment of debt
Gain (Loss) on Extinguishment of Debt
Credit Facility [Domain]
Credit Facility [Domain]
SL Green stockholders' equity:
Equity, Attributable to Parent [Abstract]
Building and improvements
Investment Building and Building Improvements
Repurchases of common stock
Treasury Stock, Value, Acquired, Cost Method
Deferred revenue
Deferred Revenue
450 Park Avenue
450 Park Avenue [Member]
450 Park Avenue
Interest rate, fixed rate debt (as a percent)
Coupon Rate (as a percent)
Debt Instrument, Interest Rate, Stated Percentage
Investment, Name [Axis]
Investment, Name [Axis]
Debt Investment
Debt Investments in Mortgage Loans [Member]
Represents debt investments in mortgage loans on real estate.
Real Estate Properties [Domain]
Real Estate Properties [Domain]
Entity Voluntary Filers
Entity Voluntary Filers
SL Green partners' capital (757 and 756 general partner common units, and 70,402 and 70,341 limited partner common units outstanding at December 31, 2025 and 2024, respectively)
General And Limited Partners Capital Account
General And Limited Partners Capital Account
Additions to land, buildings and improvements
Payments To Acquire Land, Buildings And Improvements
Payments To Acquire Land, Buildings And Improvements
Financing Lease Costs
Finance Lease, Costs [Abstract]
Finance Lease, Costs [Abstract]
Capital
Partners' Capital [Abstract]
Investments acquired
Investment Company, Debt Fund Investments, Investments Acquired, Fair Value
Investment Company, Debt Fund Investments, Investments Acquired, Fair Value
Interest rate cap and swap agreements (included in Other assets)
Fair Value
Derivative Asset, Subject to Master Netting Arrangement, before Offset
Land and land interests
Land
Land
Senior obligations of consolidated securitization vehicles
Servicing Liability at Fair Value, Amount
Entity Registrant Name
Entity Registrant Name
Estimated current balance held in other comprehensive income to be reclassified to earnings within the next twelve months
Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months
Preferred units, shares outstanding (in shares)
Temporary Equity, Shares Outstanding
Distributions to noncontrolling interests in other partnerships
Distributions to Noncontrolling Interests Other Partnerships
The cash outflow for distributions to the entity's partner from a consolidated joint venture.
Stock Price or TSR Estimation Method
Stock Price or TSR Estimation Method [Text Block]
Interest expense, net of interest income
Interest expense, net of interest income
Interest expense, net of interest income
Interest Expense, Other
Debt Fund Investments
Debt Fund Investments [Policy Text Block]
Debt Fund Investments
Basic weighted average common units outstanding (in shares)
Weighted Average Limited Partnership Units Outstanding, Basic
461 Fifth Avenue
Fifth Avenue, 461 [Member]
Represents the information pertaining to 461 Fifth Avenue, a property owned by the entity.
Fourth Amended and Restated 2003 Stock Option and Incentive Plan
Fourth Amended and Restated 2003 Stock Option and Incentive Plan [Member]
Fourth Amended and Restated 2003 Stock Option and Incentive Plan [Member]
Perpetual preferred unit dividends
Distributions Preferred Units
Distributions declared for preferred units during the period.
Current period provision for loan loss
Provision for Loan, Lease, and Other Losses
1185 Avenue of the Americas
Avenue of the Americas, 1185 [Member]
Represents the information pertaining to 1185 Avenue of the Americas, a property owned by the entity.
Preferred stock, dividend, multiplier per common unit distribution
Preferred Stock Dividend Multiplier Ratio Per Common Unit Distribution
Preferred Stock Dividend Multiplier Ratio Per Common Unit Distribution
Real estate loans held by consolidated securitization vehicles
Servicing Asset at Fair Value, Amount
Payments to Acquire Equity Securities, FV-NI
Payments to Acquire Equity Securities, FV-NI
Schedule of Debt and Preferred Equity Investments
Schedule of Debt [Table Text Block]
Stabilization of property, anniversary period
Related Party Transaction, Stabilization Of Property, Anniversary Period
Related Party Transaction, Stabilization Of Property, Anniversary Period
Real Estate Property Ownership [Axis]
Real Estate Property Ownership [Axis]
Related Party [Axis]
Related and Nonrelated Parties [Axis]
Joint venture sold (as a percent)
Equity Method Investment, Amount Sold, Percentage
Equity Method Investment, Amount Sold, Percentage
Stock-based compensation plans (in shares)
Incremental Common Units Attributable to Share based Payment Arrangements
Incremental Common Units Attributable to Share based Payment Arrangements
Restatement Determination Date:
Restatement Determination Date [Axis]
February 2029
Interest Rate Cap Expiring in February 2029 [Member]
Interest Rate Cap Expiring in February 2029
Multiemployer Plans [Line Items]
Multiemployer Plan [Line Items]
Gain (Loss) on Sale
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax
Accumulated Other Comprehensive Income (Loss) [Table]
Accumulated Other Comprehensive Income (Loss) [Table]
Issuance of common units
Issuance of preferred units
Noncontrolling Interest, Increase from Subsidiary Equity Issuance
450 Park Avenue
Park Avenue, 450 [Member]
Park Avenue, 450
Mortgage loans on real estate, interest rate
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Interest Rate
Amounts reclassified from accumulated other comprehensive income
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax
RXR Realty / New York REIT
RXR Realty / New York REIT [Member]
RXR Realty / New York REIT
Name
Trading Arrangement, Individual Name
Deferred Revenue Arrangement By Type Table [Line Items]
Deferred Revenue Arrangement By Type Table [Line Items]
Deferred Revenue Arrangement By Type Table [Line Items]
Shares that may be issued if equal to fungible units (shares) (less than)
Share Based Compensation Arrangement by Share Based Payment Award, Number of Shares to be Issued if Equal to Fungible Units
Represents the number of shares that would be issued under the plan if shares issued is equal to fungible units; actual shares issued may be more or less depending on the type of awards issued and the ratio of fungible units to shares under each award.
3 - High Risk Assets - Loss more likely than not
Risk Level, High [Member]
Acquisition of subsidiary interest from noncontrolling interest
Redemption and conversion of common units
Redemption of preferred units
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests
Series R
Series R Preferred Stock [Member]
Series R Preferred Stock [Member]
Debt instrument, face amount
Debt Instrument, Face Amount
Debt Fund
Investment In Debt Fund Securities [Text Block]
Investment In Debt Fund Securities
Gross amount
Finite Lived Intangible Liabilities, Gross
Represents the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible liabilities having statutory or estimated useful lives.
Term of extension
Line Of Credit Facility, Term Of Extension
Line Of Credit Facility, Term Of Extension
Statement of Comprehensive Income [Abstract]
Statement of Comprehensive Income [Abstract]
Operating expenses, including related party expenses of $9 in 2025, $7 in 2024 and $5 in 2023
Payments made for services
Operating Expenses
Operating Costs and Expenses
800 Third Avenue
800 Third Avenue [Member]
800 Third Avenue
Preferred Stock
Preferred Units
Preferred Stock [Member]
Name
Awards Close in Time to MNPI Disclosures, Individual Name
Non-cash lease expense
Non Cash Lease Expense
Non Cash Lease Expense
Duration of each offering period starting the first day of each calendar quarter (in months)
Share Based Compensation Arrangement by Share Based Payment Award, Duration of Offering Periods
Represents the duration of each offering period during which the shares are offered for purchase under the stock-based compensation plan of the entity.
Aggregate Erroneous Compensation Not Yet Determined
Aggregate Erroneous Compensation Not Yet Determined [Text Block]
Schedule of Calculation of Numerator And Denominator In Earnings Per Unit
Schedule of Calculation of Numerator and Denominator in Earnings Per Unit [Table Text Block]
Schedule of Calculation of Numerator and Denominator in Earnings Per Unit [Table Text Block]
Other comprehensive loss (income) attributable to noncontrolling interests
Accumulated other comprehensive income (loss) allocation
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest
ICFR Auditor Attestation Flag
ICFR Auditor Attestation Flag
Percentage of eligible compensation matched by employer
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay
Audit Information [Abstract]
Audit Information
January 2026
Interest Rate Cap Expiring in January 2026, 3 [Member]
Interest Rate Cap Expiring in January 2026, 3
Interest income
Sales-type Lease, Interest Income
Finance Lease, Liability, Maturity
Finance Lease, Liability, to be Paid, Maturity [Table Text Block]
Noncontrolling interests in Operating Partnership
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount
Shares issued (in shares)
Deferred Compensation Arrangement with Individual, Shares Issued
Debt securities, held-to-maturity, amortized cost, discount
Debt Securities, Held-to-Maturity, Amortized Cost, Discount
Debt Securities, Held-to-Maturity, Amortized Cost, Discount
Auditor Firm ID
Auditor Firm ID
Segment [Domain]
Segments [Domain]
Statement of Income Location, Balance [Axis]
Statement of Income Location, Balance [Axis]
Investment fair value adjustment
Charge related to fair value adjustment
Assets, Fair Value Adjustment
Ability to borrow under line of credit facility
Line of Credit Facility, Remaining Borrowing Capacity
Consolidation of securitization vehicle assets
Consolidation Of Securitization Vehicle Assets
Consolidation Of Securitization Vehicle Assets
Debt and Preferred Equity Investments
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]
Fair Value, Measurements, Fair Value Hierarchy [Domain]
Fair Value Hierarchy and NAV [Domain]
15 Beekman
15 Beekman [Member]
15 Beekman
Statement of Financial Position Location, Balance [Domain]
Statement of Financial Position Location, Balance [Domain]
Unconsolidated
Unconsolidated Properties [Member]
Preferred units and redeemable equity
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount
Net unrealized (loss) gain on marketable securities
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
U.S. Affiliate of Mori Trust Co., Ltd
U.S. Affiliate of Mori Trust Co., Ltd [Member]
U.S. Affiliate of Mori Trust Co., Ltd
Earnings per Share of the Company
Earnings Per Share, Policy [Policy Text Block]
Revenue Recognition
Revenue [Policy Text Block]
Series I Preferred Stock, $0.01 par value, $25.00 liquidation preference, 9,200 issued and outstanding at both December 31, 2025 and 2024
Preferred Stock, Value, Issued
Stockholders' Equity
Stockholders Equity [Line Items]
-- None. No documentation exists for this element. --
Accrued interest payable
Interest Payable
2024
Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year
Capital Gains 2024 Dividend
O 2024 A Capital Gains Dividends [Member]
O 2024 A Capital Gains Dividends
Building (leasehold interest)
Building Leasehold Interest [Member]
Represents information pertaining to long-lived, depreciable structures held for productive use, including office, production, storage and distribution facilities, in which the entity has a leasehold interest.
Redemption of preferred stock
Redemption of preferred units
Payments for Repurchase of Redeemable Preferred Stock
Investment in joint venture, ownership percentage
Investment In Joint Venture, Ownership Percentage
Investment In Joint Venture, Ownership Percentage
Financial Asset, Period Past Due [Axis]
Financial Asset, Aging [Axis]
All Executive Categories
All Executive Categories [Member]
Stabilization of property, within three years after stabilization, percent
Related Party Transaction, Stabilization Of Property, Within Three Years After Stabilization, Percent
Related Party Transaction, Stabilization Of Property, Within Three Years After Stabilization, Percent
Common stock, $0.01 par value, 160,000 shares authorized and 71,159 and 71,097 issued and outstanding at December 31, 2025 and 2024, respectively
Common Stock, Value, Issued
September 2028
Interest Rate Swap Expiring September 2028 , 1 [Member]
Interest Rate Swap Expiring September 2028 , 1
Right-of-use asset - financing leases
Finance Lease, Right-of-Use Asset, after Accumulated Amortization
Total expenses
Total Costs and Expenses Including Nonoperating Income (Expense)
This element represents the total of the costs related to real estate revenues, including management, leasing, and development services and income (expense) from ancillary business-related activities.
Less: undistributed earnings allocated to participating securities
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic
1-6 Landmark Square
Landmark Square 1 to 6 [Member]
Represents the information pertaining to 1-6 Landmark Square, a property owned by the entity.
Less: distributed earnings allocated to participating securities
Less: distributed earnings allocated to participating securities
Distributed Earnings
Commitments and contingencies (See Note 20)
Commitments and Contingencies
Series W
Series W Preferred Stock [Member]
Series W Preferred Stock [Member]
Cash and restricted cash assumed from consolidation of real estate investment
Cash Acquired from Acquisition
Business Combination [Axis]
Business Combination [Axis]
Comprehensive (loss) income
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Number of financing receivables on non-accrual without allowance for loan loss
Financing Receivable, Nonaccrual, No Allowance, Number
Financing Receivable, Nonaccrual, No Allowance, Number
Investment in joint venture aggregate maximum ownership percentage
Investment In Joint Venture Aggregate Maximum Ownership Percentage
Investment In Joint Venture Aggregate Maximum Ownership Percentage
Noncontrolling Interests
Noncontrolling Interest [Member]
Investments in Unconsolidated Joint Ventures
Equity Method Investments [Policy Text Block]
Ownership interest
Ownership interest (as a percent)
Ownership Interest Sold
Equity Method Investment, Ownership Percentage
Basic (Loss) Earnings:
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
SLG Management LLC
SLG Management LLC [Member]
SLG Management LLC [Member]
Thereafter
Lessor, Operating Lease, Payment to be Received, after Year Five
Net (loss) income attributable to SL Green common stockholders (numerator for basic earnings per share)
Net Income (Loss) Available To Common Stockholders, After Distributed And Undistributed Earnings Allocation, Basic
Net Income (Loss) Available To Common Stockholders, After Distributed And Undistributed Earnings Allocation, Basic
One Vanderbilt Avenue
One Vanderbilt Avenue
One Vanderbilt [Member]
One Vanderbilt [Member]
Debt and preferred equity investments
Debt And Preferred Equity Reserves
Debt And Preferred Equity Reserves
Maximum borrowing capacity, optional expansion
Line of Credit Facility, Optional Expansion, Maximum Borrowing Capacity
The expanded maximum borrowing capacity available, which is subject to agreement with the entity.
Concentration of Credit Risk
Concentration Risk [Line Items]
Basic units:
Net Income (Loss), Per Outstanding Limited Partnership Unit, Basic, Other Disclosure [Abstract]
280 Park Avenue
280 Park Avenue [Member]
280 Park Avenue
Number of investments, nonperforming
Number Of Investments, Nonperforming
Number Of Investments, Nonperforming
PEO Actually Paid Compensation Amount
PEO Actually Paid Compensation Amount
Lapsed or cancelled (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period
Distributions from debt fund investments
Noncontrolling Interest, Decrease From Distributions From Debt Fund Investments
Noncontrolling Interest, Decrease From Distributions From Debt Fund Investments
Exchange of debt investment for real estate or equity in joint venture
Exchange Of Debt Investment For Real Estate Or Equity In Joint Venture
Exchange Of Debt Investment For Real Estate Or Equity In Joint Venture
Capital Gains 2025 Dividend
O 2025 A Capital Gains Dividends [Member]
O 2025 A Capital Gains Dividends
Schedule of Mortgages and Other Loans Payable
Mortgage And Other Loans Payable [Table Text Block]
Mortgage And Other Loans Payable [Table Text Block]
February 2027
Interest Rate Swap Expiring in February 2027 [Member]
Interest Rate Swap Expiring in February 2027
10 East 53rd Street
East 53rd Street 10 [Member]
Represents information pertaining to 10 East 53rd Street, a joint venture property of the entity.
Series V Preferred Stock
Series V
Series V Preferred Stock [Member]
Series V Preferred Stock [Member]
Secured borrowing (included in Other liabilities)
Debt Instrument, Fair Value Disclosure
Number of Buildings
Number of Real Estate Buildings
Number of Real Estate Buildings
Consolidation of securitization vehicle liabilities
Consolidation Of Securitization Vehicle Liabilities
Consolidation Of Securitization Vehicle Liabilities
Accumulated amortization
Finite Lived Intangible Liabilities, Accumulated Amortization
Represents the accumulated amount of amortization of a major finite-lived intangible liability class.
Weighted average amortization period, in-place lease costs
Weighted Average Amortization Period, In-Place Lease Costs
Weighted Average Amortization Period, In-Place Lease Costs
Debt fund investments, at fair value
Debt fund investments
Debt Fund Investments
Debt Fund Investments
Derivative Contract Type [Domain]
Derivative Contract [Domain]
Proceeds from issuance of common stock
Dividend reinvestments/stock purchases under the DRSPP
Proceeds from Issuance of Common Stock
Real estate loans held by consolidated securitization vehicles (1)
Loan, Managed and Securitized or Asset-Backed Financing Arrangement, Principal Outstanding
Portion of compensation capitalized
Deferred Lease Costs Capitalized in Period
Represents the amount of deferred lease costs capitalized during the period.
All Individuals
All Individuals [Member]
Long-term Debt, Type [Domain]
Long-Term Debt, Type [Domain]
Residential
Residential Real Estate [Member]
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Abstract]
Name
Forgone Recovery, Individual Name
SUMMIT Operator revenue
Segment Operator Revenue
Segment Operator Revenue
Award expiration period (in years)
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period
Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested
Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member]
Percentage of profits due to investors
Related Party Transaction, Percentage of Profits Due to Investors
Related Party Transaction, Percentage of Profits Due to Investors
15 Beekman
Beekman, 15 [Member]
Beekman, 15
Shares of common stock available for issuance (shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent
Period of commencement of option vesting, from date of grant (in years)
Share Based Compensation Arrangement by Share Based Payment Award, Period of Award Vesting Commencement
Represents the period from the date of grant of the awards for the commencement of vesting of awards.
Schedule of Notional and Fair Value of Derivative Financial Instruments and Foreign Currency Hedges
Schedule of Derivative Instruments [Table Text Block]
Consolidation of a subsidiary
Consolidation Of A Subsidiary
Consolidation Of A Subsidiary
Worldwide Plaza
Worldwide Plaza [Member]
Worldwide Plaza [Member]
Erroneous Compensation Analysis
Erroneous Compensation Analysis [Text Block]
919 Third Avenue
919 Third Avenue [Member]
919 Third Avenue
2 Herald Square
Herald Square, 2 [Member]
2 Herald Square [Member]
Rule 10b5-1 Arrangement Terminated
Rule 10b5-1 Arrangement Terminated [Flag]
Real Estate by Location [Axis]
Real Estate by Location [Axis]
Represents details pertaining to the locations of real estate properties of the entity.
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Lease Income
Lessor, Operating Leases [Text Block]
Debt Fund Subscription Line
Debt Fund Subscription Line [Member]
Debt Fund Subscription Line
Erroneously Awarded Compensation Recovery
Erroneously Awarded Compensation Recovery [Table]
4.27% Senior unsecured notes maturing on December 17, 2025
Senior Unsecured Note Due December 17, 2025 [Member]
Senior Unsecured Note Due December 17, 2025 [Member]
Interest income
Interest Income, Operating
Concentration Risk Benchmark [Domain]
Concentration Risk Benchmark [Domain]
Title of 12(b) Security
Title of 12(b) Security
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate Schedule [Table]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate Schedule [Table]
Loan loss and other investment reserves, net of recoveries
Loan loss and other investment reserves, net of recoveries
Loan loss and other investment reserves, net of recoveries
Loan loss and other investment reserves, net of recoveries
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal)
Disposal Groups, Including Discontinued Operations [Table]
Disposal Groups, Including Discontinued Operations [Table]
Number of securities in unrealized gain position
Debt Securities, Available-for-Sale, Number of Positions
Debt Securities, Available-for-Sale, Number of Positions
Excess stock, par value (in dollars per share)
Excess Stock, Par or Stated Value Per Share
Face amount or stated value of excess stock per share, which is generally not indicative of the fair market value per share.
Mortgages and other loans payable
Mortgage and Other Loans Payable [Member]
Represents mortgage and other loans payable of the entity.
Earnings Per Share
Earnings Per Share [Abstract]
2030
Lessee, Operating Lease, Liability, to be Paid, Year Five
Distributions in excess of cumulative earnings from unconsolidated joint ventures
Proceeds from Equity Method Investment, Distribution, Return of Capital
Unrealized gain
Debt Securities, Available-for-Sale, Unrealized Gain
Real estate loans held by consolidated securitization vehicles
Real Estate Loans Held By Consolidated Securitization Vehicles [Member]
Real Estate Loans Held By Consolidated Securitization Vehicles
Schedule of consolidated interest expense, excluding capitalized interest
Interest Income and Interest Expense Disclosure [Table Text Block]
PGIM Real Estate
PGIM Real Estate [Member]
PGIM Real Estate
Fair value adjustment
Minority Interest Increase (Decrease) from Fair Value Adjustment
Represents the increase (decrease) in noncontrolling interest resulting from fair value adjustments.
Proceeds from sale or redemption of real estate loans held by consolidated securitization vehicles
Proceeds From Sale Or Redemption Of Real Estate Loans Held by Consolidated Securitization Vehicles
Proceeds From Sale Or Redemption Of Real Estate Loans Held by Consolidated Securitization Vehicles
Effect of Dilutive Securities:
Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract]
Thereafter
Finance Lease, Liability, to be Paid, after Year Five
Investment in Commercial Real Estate Properties
Investment in Real Estate [Policy Text Block]
Disclosure of accounting policy for investments in real estate properties.
Award Timing Disclosures [Line Items]
Add back: dilutive effect of earnings allocated to participating securities and contingently issuable shares
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted
Marc Holliday, Chairman And CEO
Marc Holliday, Chairman And CEO [Member]
Marc Holliday, Chairman And CEO [Member]
Acquired Above-market Leases, Net of Acquired Below-market Leases
Lease Agreements [Member]
Schedule of Combined Statements of Income for the Unconsolidated Joint Ventures
Equity Method Investments, Summarized Financial Information Income Statement [Table Text Block]
Disclosure of summarized income statement information for investments accounted for using the equity method of accounting.
Commercial real estate properties, at cost:
Real Estate Investment Property, at Cost [Abstract]
Other comprehensive income (loss) before reclassifications
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax
Stockholders' Equity of the Company
Partners' Capital of the Operating Partnership
Equity [Text Block]
Accrued dividends on preferred units
Noncontrolling Interest, Accrued Dividends On Preferred Units
Noncontrolling Interest, Accrued Dividends On Preferred Units
Purchase price and other fair value adjustments
Gain (Loss) On Purchase Price Fair Value Adjustment Gross
Gain (Loss) On Purchase Price Fair Value Adjustment Gross
Total after allowance for loan loss
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss
Net (loss) income attributable to SL Green
Net Income (Loss) Attributable to Parent
November 2026
Interest Rate Cap Expiring in November 2026 [Member]
Interest Rate Cap Expiring in June 2025
Deferred Revenue Arrangement By Type Table [Table]
Deferred Revenue Arrangement By Type Table [Table]
Deferred Revenue Arrangement By Type Table [Table]
Belmont
Belmont Insurance Company [Member]
Represents the information pertaining to Belmont Insurance Company, a wholly-owned taxable REIT subsidiary.
Depreciable real estate reserves and impairments
Depreciable Real Estate Reserves, Cash Flow Effect
Depreciable Real Estate Reserves, Cash Flow Effect
Total commercial real estate properties, net
Commercial real estate property, net
Real Estate Investment Property, Net
Fixed lease payments
Operating Lease, Lease Income, Lease Payments
Carrying value of investment in leasehold interest
Total
Balance at beginning of year
Balance at end of year
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Gross
Options vesting period (in years)
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period
Segment information
Segment Reporting Information [Line Items]
Preferred stock, shares authorized (shares)
Preferred Stock, Shares Authorized
Adoption Date
Trading Arrangement Adoption Date
Reclassification
Reclassification, Comparability Adjustment [Policy Text Block]
Share price (in dollars per share)
Shares Issued, Price Per Share
Senior notes, net of deferred finance costs
Senior Notes, Net of Deferred Finance Costs
Senior Notes, Net of Deferred Finance Costs
Mezzanine Loan Due August 2025
Mezzanine Loan Due August 2025 [Member]
Mezzanine Loan Due August 2025
Improvements
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Improvements
Amortization of acquired above and below-market leases
Amortization of above and below Market Leases
Interest Rate
Investment Interest Rate
Customer [Axis]
Customer [Axis]
Real Estate segment net operating income
Operating Income (Loss)
Line of Credit
Line of Credit [Member]
Series S
Series S Preferred Stock [Member]
Series S Preferred Stock [Member]
Retained deficit
Retained Earnings (Accumulated Deficit)
Name of Property [Axis]
Name of Property [Axis]
115 Spring Street
Spring Street 115 [Member]
Spring Street 115 [Member]
Excess shares issued (shares)
Excess Stock, Shares Issued
Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested
Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member]
220 East 42nd Street
East 220 Street 42 [Member]
Represents the information pertaining to 220 East 42nd Street, a property owned by the entity.
Holliday
Holliday [Member]
Holliday
Debt securities, available-for-sale, continuous unrealized loss position, less than 12 months, number of positions
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions
Depreciable real estate reserves and impairments
Charge for capital contributions
Depreciable real estate reserves
Depreciable Real Estate Reserves, Effect on Earnings
Depreciable Real Estate Reserves, Effect on Earnings
Class of Stock [Axis]
Class of Stock [Axis]
Employee contribution limit per calendar year
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent
February 2028
Interest Rate Swap Expiring in February 2028 [Member]
Interest Rate Swap Expiring in February 2028
Net unrealized gain (loss) on derivative instruments
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table
Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member]
Alternative strategy portfolio
Alternative Strategy Portfolio [Member]
Alternative Strategy Portfolio
Multiemployer Plan Type [Axis]
Retirement Plan Type [Axis]
Commercial Property
Commercial Property [Member]
Commercial Property [Member]
Statement [Table]
Statement [Table]
Schedule of Property Acquisitions and Consolidations
Business Combination [Table Text Block]
Financing Activities
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]
810 Seventh Avenue
Seventh Avenue, 810 [Member]
Represents the information pertaining to 810 Seventh Avenue, a property owned by the entity.
Beginning balance (units)
Ending balance (units)
Partners' Capital Account, Units
Shares, issued (in shares)
Shares, Issued
Net proceeds from disposition of real estate/joint venture interest
Proceeds from Real Estate and Real Estate Joint Ventures
Equity interest held by partner
Special Purpose Entity, Consideration Transferred, Equity Interest Issued and Issuable
Special Purpose Entity, Consideration Transferred, Equity Interest Issued and Issuable
Measurement adjustment for redeemable noncontrolling interest
Operating Partnership Noncontrolling Interest Fair Value Adjustment
Represents the fair value adjustment to the noncontrolling interest in the operating partnership.
Deferred revenue
Contract with Customer, Liability
Fungible units per share (in fungible units per share)
Share Based Compensation Arrangement by Share Based Payment Award, Fungible Units Per Share
Share Based Compensation Arrangement by Share Based Payment Award, Fungible Units Per Share
Lease Classification
Lessor, Leases [Policy Text Block]
Maximum percentage of annualized rent for any one tenant not individually disclosed (percent) (more than)
Concentration Risk Percentage Threshold
Represents the maximum percentage of concentration risk that is not individually disclosed.
Organization and Basis of Presentation
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Average yield (as a percent)
Interest-Earning Assets, Average Yield
Repayments of revolving credit facility, term loans and senior unsecured notes
Repayments of Unsecured Debt
Rollforward Analysis of Preferred Unit Activity
Rollforward Analysis of Preferred Unit Activity [Roll Forward]
Rollforward Analysis of Preferred Unit Activity [Roll Forward]
All Adjustments to Compensation
All Adjustments to Compensation [Member]
Fixed rate debt
Long-Term Debt, Percentage Bearing Fixed Interest, Amount
Amendment Flag
Amendment Flag
Number of shares available for issuance (shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized
Loss reserves
Liability for Claims and Claims Adjustment Expense
Annual award vesting rate, low end of range (as a percent)
Share Based Compensation Arrangement by Share Based Payment Award, Award Vesting Rate, Low End of Range
Represents the low end of the range of annual vesting rates that occurs once performance criteria are reached.
2026
Sales-Type and Direct Financing Leases, Payment to be Received, Year One
Schedule of Ground Lease Arrangements
Schedule Of Ground Lease Arrangements [Table Text Block]
Schedule Of Ground Lease Arrangements [Table Text Block]
Termination Date
Trading Arrangement Termination Date
Insider Trading Policies and Procedures Adopted
Insider Trading Policies and Procedures Adopted [Flag]
Rockpoint Capital
Rockpoint Capital [Member]
Rockpoint Capital
Mezzanine Loan Due December 2025
Mezzanine Loan Due December 2025 [Member]
Mezzanine Loan Due December 2025
Allowance for loan and lease losses
Balance at beginning of year
Balance at end of year
Allowance for loan loss
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest
21 East 66th Street
East 21 Street 66 [Member]
Represents the information pertaining to 21 East 66th Street, a joint venture property of the entity.
Operating lease, weighted average discount rate, percent
Operating Lease, Weighted Average Discount Rate, Percent
Number of real estate properties acquired from third party
Number Of Real Estate Properties Acquired From Third Party
Number Of Real Estate Properties Acquired From Third Party
Summary of The Status of Stock Options And Changes During The Period
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
Vornado Realty Trust
Vornado Realty Trust [Member]
Vornado Realty Trust
Dividends Payable [Table]
Dividends Payable [Table]
Transfer of investments to debt fund
Transfer from Investments
Basic weighted average common shares outstanding (in shares)
Weighted average common stock outstanding (in shares)
Weighted Average Number of Shares Outstanding, Basic
Right of use assets - financing leases
Right Of Use Assets Financing Lease [Member]
Right Of Use Assets Financing Lease [Member]
May 2027
Interest Rate Swap Expiring May 2027 [Member]
Interest Rate Swap Expiring January 2026 [Member]
Schedule of Earnings Per Share
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Initial allowance for credit losses on loans purchased with credit deterioration ("PCD")
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date
Options exercisable at end of period (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number
Segment Reporting [Abstract]
Segment Reporting [Abstract]
Interest rate, floating rate debt (as a percent)
Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate
Debt Disclosure [Abstract]
Debt Disclosure [Abstract]
Expenses
Costs and Expenses [Abstract]
Income Tax Authority, Name [Axis]
Income Tax Authority, Name [Axis]
555 W. 57th Street
W 57 Street 555 [Member]
Represents the information pertaining to 555 W. 57th Street, a property owned by the entity.
Financing leases
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments, Fiscal Year Maturity [Abstract]
Interest expense, net of interest income
Interest Expense, Other, Adjustment
Interest Expense, Other, Adjustment
Fair Value Disclosure of Asset and Liability Not Measured at Fair Value [Table]
Fair Value Disclosure of Asset and Liability Not Measured at Fair Value [Table]
Forgone Recovery due to Expense of Enforcement, Amount
Forgone Recovery due to Expense of Enforcement, Amount
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, par value (in dollars per share)
Common Stock, Par or Stated Value Per Share
Consolidated Entities [Axis]
Consolidated Entities [Axis]
110 Greene Street
110 Greene Street [Member]
110 Greene Street [Member]
Shares of common stock issued (shares)
Common Stock, Shares Held in Employee Trust, Shares
Schedule of Contributions Made To Multi-employer Plans
Multiemployer Plan [Table Text Block]
Revolving Credit Facility, Maturity March 31, 2022
Revolving Credit Facility, Maturity March 31, 2022 [Member]
Revolving Credit Facility, Maturity March 31, 2022 [Member]
Fair market value
Debt Securities, Available-for-Sale, Unrealized Gain, Fair Market Value
Debt Securities, Available-for-Sale, Unrealized Gain, Fair Market Value
Initial extended term
Investment Company, Debt Fund Investment, Term Extension Period
Real Estate Fund Investments, Number Of One Year Periods
Use of Estimates
Use of Estimates, Policy [Policy Text Block]
Term Loan B, Maturity November 2025
Term Loan B, Maturity November 2025 [Member]
Term Loan B, Maturity November 2025
Dividends paid on common and preferred stock
Distributions paid on common and preferred units
Payments of Dividends
100 Park Avenue
Park Avenue, 100 [Member]
Represents the information pertaining to 100 Park Avenue, a joint venture property of the entity.
500 Park Avenue
500 Park Avenue [Member]
500 Park Avenue
Interest on financing leases
Interest on financing leases before capitalized interest
Finance Lease, Interest Expense, Before Capitalized Interest
Finance Lease, Interest Expense, Before Capitalized Interest
Diluted earnings (loss) per unit (in dollars per share)
Net Income (Loss), Net of Tax, Per Outstanding Limited Partnership Unit, Diluted
Fair Value Measurements, Recurring And Nonrecurring
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
690 Madison Avenue
690 Madison Avenue [Member]
690 Madison Avenue
Insider Trading Arrangements [Line Items]
prior
Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year
Schedule Of Sales Type Leases
Schedule Of Sales Type Leases [Table Text Block]
Schedule Of Sales Type Leases
11 Madison Avenue
Madison Ave, 11 [Member]
11 Madison Ave [Member]
Investment income
Investment Income, Interest and Dividend
Number of collective bargaining agreements
Number of Collective Bargaining Arrangements
Represents the number of collective bargaining arrangements.
Total liabilities
Liabilities
Facility fee (as a percent)
Line of Credit Facility, Commitment Fee Percentage
2030
Finance Lease, Liability, to be Paid, Year Five
Pension Adjustments Prior Service Cost
Pension Adjustments Prior Service Cost [Member]
Material Terms of Trading Arrangement
Material Terms of Trading Arrangement [Text Block]
Depreciation expense (including amortization of the capital lease asset)
Commercial Real Estate Properties Depreciation and Amortization
The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production related to Commercial Real Estate Properties.
919 Third Avenue
Third Avenue, 919 [Member]
Represents the information pertaining to 919 Third Avenue, a property owned by the entity.
Proceeds from issuance of common stock
Stock Issued During Period, Value, New Issues
Consolidation Items [Axis]
Consolidation Items [Axis]
Counterparty Name [Axis]
Counterparty Name [Axis]
All other awards
Other Awards [Member]
Represents awards granted by the entity that deliver the full value of the award upon vesting.
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Non-NEOs
Non-NEOs [Member]
Rent Expense
Rent Expense [Policy Text Block]
Disclosure of accounting policy for recognizing rent expense.
Repayments of principal
Long Term Debt, Maturities, Repayments of Principal
Total amount of long-term debt maturing in future periods.
Book value of collateral
Collateral Already Posted, Aggregate Fair Value