What was permitted
Residents on the Upper East Side-Carnegie Hill may observe significant structural changes as a 7-story, 3-family mixed-use building is being converted into a single-family home. This involves extensive work like elevator upgrades and floor modifications.
This major structural undertaking, with an estimated cost of $200,001.64, was permitted on July 13, 2026. COW BAY SPRINKLER CORP (GC) is the contractor responsible for this complex conversion, which includes adding convenience stairs and new spiral staircases.
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View the official permit record
Tracking number, work description, cost and dates
View the official permit record
Tracking number, work description, cost and dates
| Tracking number | 925923793 |
|---|---|
| Work permit # | M01254461-S2-ST |
| Job filing number | — |
| Work type | Structural |
| Status | Permit Issued |
| Job description | Structural Scope of Work : Conversion of a 7-story, 3-family mixed-use building to a single-family home, including elevator upgrades, convenience stair extensions, floor infills, and new spiral staircase installation. |
| Floor / unit | Floor Number(s)-3-SO-1487-M01254461-I1, Floor Number(s)-5-SO-6843-M01254461-I1, Floor Number(s)-7-SO-6056-M01254461-I1, Floor Number(s)-4-SO-4122-M01254461-I1, Floor Number(s)-6-SO-3399-M01254461-I1, |
| Estimated cost | $200,002 |
| Approved | September 9, 2025 |
| Issued | July 13, 2026 |
| Expires | April 30, 2027 |
| BBL | — |
| BIN | — |
Property owner
Sebastian Capital INC
James Colletti
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