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Cover
Jun. 01, 2020
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jun. 01, 2020
Entity File Number 1-13199
Entity Registrant Name SL GREEN REALTY CORP.
Entity Central Index Key 0001040971
Entity Tax Identification Number 13-3956775
Entity Incorporation, State or Country Code MD
Entity Address, Address Line One 420 Lexington Avenue
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10170
City Area Code 212
Local Phone Number 594-2700
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document Information [Line Items]  
Title of 12(b) Security Common Stock, $0.01 par value
Trading Symbol SLG
Security Exchange Name NYSE
Preferred Stock  
Document Information [Line Items]  
Title of 12(b) Security 6.500% Series I Cumulative Redeemable Preferred Stock, $0.01 par value, $25.00 mandatory liquidation preference
Trading Symbol SLG.PRI
Security Exchange Name NYSE