HVAC Modifications at 11 Madison Avenue
11 MADISON AVENUE, MANHATTAN, 10010 · Midtown South-Flatiron-Union Square
What was permitted
This permit covers modifications to the existing HVAC system, including duct work and the installation of chiller water air handling units, at 11 Madison Avenue. The project is taking place on the Cellar, 1st floor, and 1st Floor Mezzanine.
The permit was issued on April 17, 2026, with an estimated cost of $990,000. The contractor listed is M & S MECHANICAL SERVICES.
This large-scale HVAC project at 11 Madison Avenue reflects significant investment in mechanical systems within the Midtown South-Flatiron-Union Square neighborhood.
What it cost
Issued
April 17, 2026
Expires
May 29, 2026
License
General Contractor
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Filed by M & S MECHANICAL SERVICES · 3 permits across 3 neighborhoods
View the official permit record
Tracking number, work description, cost, and dates
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View the official permit record
Tracking number, work description, cost, and dates
| Tracking Number | 208072313 |
| Work Permit # | M01334241-I1-MS |
| Job Filing Number | — |
| Work Type | Mechanical Systems |
| Status | Permit Issued |
| Job Description | Modifications to the existing HVAC system and associated duct work, and the installation of chiller water air handling units on the Cellar, 1st floor, and 1st Floor Mezzanine, as per plans. No change to use, egress, or occupancy. |
| Floor / Unit | Cellar, Floor Number(s) 1 through 1, Mezzanine 1 through 2 |
| Estimated Cost | $990,000 |
| Approved | March 6, 2026 |
| Issued | April 17, 2026 |
| Expires | May 29, 2026 |
| BBL | — |
| BIN | — |
Property Owner
SL GREEN REALTY CORP
Gianna Pilalis