Rendering Revealed for Office-To-Hotel Conversion At 509 Madison Avenue in Midtown, Manhattan
509 MADISON AVENUE, New York, NY, USA in Midtown East, Manhattan is a property zoned C5-3. The building spans built in 1929, 134,039 gross square feet, 21 floors, 2 units. It is held by 509 MADISON AVENUE LLC. Below, Crezly Research breaks down the building's ownership, debt profile, and recent nearby sales from New York City public records.
The building
| Address | 509 MADISON AVENUE, New York, NY, USA |
| BBL (Borough-Block-Lot) | 1-1288-51 |
| Zoning district | C5-3 |
| Year built | 1929 |
| Gross floor area | 134,039 sq ft |
| Lot area | 6,861 sq ft |
| Total units | 2 |
| Floors | 21 |
| Built FAR | 19.54 |
| Assessed value (total) | $20.98M |
Who owns it
509 MADISON AVENUE LLC
Owner contact & lender details
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Recorded deeds on and around this block (ACRIS).
| Address | Recorded | Price |
|---|---|---|
| 641 FIFTH AVENUE | 2026-01-05 | $3.7M |
| 641 FIFTH AVENUE | 2025-10-30 | $3.3M |
| 685 FIFTH AVENUE | 2025-09-26 | $3.35M |
| 641 FIFTH AVENUE | 2025-09-09 | $3M |
| 641 5 AVENUE | 2025-08-28 | $625,000 |
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Compiled by Crezly Research from New York City public records (ACRIS, PLUTO, DOB/HPD).
Figures are estimates from public data and may not reflect the most recent transactions. Not legal, financial or investment advice.