What was permitted
For those on the Upper East Side-Carnegie Hill, a major general construction project is underway at 1009 Fifth Avenue. This involves converting a multi-family building back to its original grand single-family residence.
The permit for this extensive renovation was issued on July 6, 2026, with an estimated project cost of $5,135,240. COW BAY SPRINKLER CORP is the general contractor managing this significant undertaking.
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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 | 649266011 |
|---|---|
| Work permit # | M01254461-I1-GC |
| Job filing number | — |
| Work type | General Construction |
| Status | Permit Issued |
| Job description | ALT1 filing to convert the 7-story, 3-family mixed-use building back to its original single-family use. Includes replacement-in-kind elevator, extended existing open stair (Cellar1st & 5th6th), and new spiral stair (6th7th). Egress unchanged since 1899 |
| Floor / unit | Cellar, Floor Number(s) 1, Floor Number(s) 1, Floor Number(s) 2, Floor Number(s) 3, Floor Number(s) 4, Floor Number(s) 5, Floor Number(s) 6, Floor Number(s) 7, Roof |
| Estimated cost | $5,135,240 |
| Approved | June 29, 2026 |
| Issued | July 6, 2026 |
| Expires | April 30, 2027 |
| BBL | — |
| BIN | — |
Property owner
Sebastian Capital INC
James Colletti
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