Company: SLG-PI
Filing Date: 2025-06-20
Form Type: S-8
Source: 0001104659-25-061169
Chunk: 0

Company: SL GREEN REALTY CORP
Filing Date: 2025-06-20
Form: S-8
Chunk 0
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<div align='center'>As filed with the Securities and Exchange Commission on June 20, 2025</div>

Registration No. 333-

<div align='center'>UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM S-8

REGISTRATION STATEMENT
UNDER THE SECURITIES ACT OF 1933

SL GREEN REALTY CORP.

(Exact name of registrant as specified in its charter)</div>

| Maryland                                 |     |            13-3956775 |
| (State or other jurisdiction of          
 incorporation or organization)           |     |      -I.R.S. Employer 
 Identification Number |
| One Vanderbilt Avenue                    
 New York, New York                       |     |                 10017 |
| (Address of Principal Executive Offices) |     |             -Zip Code |

<div align='center'>Sixth Amended and Restated 2005 Stock Option and Incentive Plan

(Full title of the plan)

Andrew S. Levine

Executive Vice President, Chief Legal Officer, General Counsel and Secretary
SL Green Realty Corp.

One Vanderbilt Avenue

New York, New York 10017
(Name and address of agent for service)

(212) 594-2700
(Telephone number, including area code, of agent for service)

Copy to:

Ettore A. Santucci, Esq.

William T. Goldberg, Esq.
Goodwin Procter LLP
100 Northern Ave.

Boston, MA 02210
Telephone: (617) 570-1000</div>

Indicate by check mark whether the registrant is a large accelerated
filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions
of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging
growth company” in Rule 12b-2 of the Exchange Act.

| Large accelerated       
 filer x                 |     | Accelerated                 
 filer ¨                     |
| Non-accelerated filer ¨ |     | Smaller reporting company ¨ |
|                         |     | Emerging growth company     
 ¨                           |

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act.