Company: SLG-PI
Filing Date: 2025-04-17
Form Type: 10-K/A
Source: 0001040971-25-000019
Chunk: 0

Company: SL GREEN REALTY CORP
Filing Date: 2025-04-17
Form: 10-K/A
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549
<div align='center'>______________________________________________________________________</div>

#### FORM 10-K/A
<div align='center'>(Amendment No. 1)</div>

☒ AMENDMENT TO ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

#### For the fiscal year ended December 31, 2024

#### OR
☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

#### For the transition period from to
<div align='center'>Commission File Number: 1-13199(SL Green Realty Corp.)

Commission File Number: 33-167793-02(SL Green Operating Partnership, L.P.)

______________________________________________________________________</div>

#### SL GREEN REALTY CORP.

#### SL GREEN OPERATING PARTNERSHIP, L.P.
<div align='center'>(Exact name of registrant as specified in its charter)

______________________________________________________________________</div>

| SL Green Realty Corp.                |     | Maryland                        |     | 13-3956775         |
| SL Green Operating Partnership, L.P. |     | Delaware                        |     | 13-3960938         |
|                                      |     | -State or other jurisdiction of 
 incorporation or organization   |     | -I.R.S. Employer   
 Identification No. |

#### One Vanderbilt Avenue, New York, NY 10017
<div align='center'>(Address of principal executive offices—Zip Code)

( 212) 594-2700

(Registrant's telephone number, including area code)

______________________________________________________________________</div>

SECURITIES REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT:

| Registrant            |     | Trading Symbol |     | Title of Each Class                                                    |     | Name of Each Exchange on Which Registered |
| SL Green Realty Corp. |     | SLG            |     | Common Stock, $0.01 par value                                          |     | New York Stock Exchange                   |
| SL Green Realty Corp. |     | SLG.PRI        |     | 6.500% Series I Cumulative Redeemable Preferred Stock, $0.01 par value |     | New York Stock Exchange                   |

SECURITIES REGISTERED PURSUANT TO SECTION 12(G) OF