Company: SLG-PI
Filing Date: 2025-05-23
Form Type: DEFA14A
Source: 0001104659-25-052509
Chunk: 0

Company: SL GREEN REALTY CORP
Filing Date: 2025-05-23
Form: DEFA14A
Chunk 0
---
<div align='center'>UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of
the
Securities Exchange Act of 1934 (Amendment No. )</div>

| ☑ | Filed by the Registrant | ☐ | Filed by a party other than the Registrant |

| CHECK                
 THE APPROPRIATE BOX: |     |                                         |
| ☐                    |     | Preliminary Proxy Statement             |
| ☐                    |     | Confidential, for Use of the Commission 
 Only (as permitted by Rule 14a-6(e)(2)) |
| ☐                    |     | Definitive Proxy Statement              |
| ☑                    |     | Definitive Additional Materials         |
| ☐                    |     | Soliciting Material under §240.14a-12   |

<div align='center'>SL Green Realty Corp.

(Name of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)</div>

| PAYMENT OF FILING FEE (CHECK ALL BOXES THAT APPLY): |     |                                                                                                     |
| ☑                                                   |     | No fee required                                                                                     |
| ☐                                                   |     | Fee paid previously with preliminary materials                                                      |
| ☐                                                   |     | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 |

Dear Fellow Stockholders,

Ahead of the annual meeting of SL Green Realty Corp. (“SL Green”
or the “Company”) on June 3, 2025 (the “Annual Meeting”), the Board of Directors (the “Board”)
and Compensation Committee (the “Committee”) want to express our appreciation for stockholders’ consistent support of
the Company over many years. The Board has provided robust oversight of our long-term strategy to create sustainable stockholder value,
while the Committee has continuously enhanced our executive compensation program to align with Company performance and stockholder value,
while retaining our talented and tenured management team.

2024 was another outstanding year for SL Green. With a total stockholder
return (“TSR”) of 58% in 2024 and 135% over the last two years, the Company was once again the #1 performing U.S. REIT (not
just office REIT) for the second