Macklowe Properties just filed to make 809 Madison Avenue bigger — both up and out. A Department of Buildings permit issued September 18 covers general construction to enlarge the building "horizontally and vertically," with an estimated cost of $11.98 million and CM and Associates Const listed as the contractor of record, according to DOB's permit filing.

The filing references a DevHUB consultation from July 18, 2025 — more than a year before this permit hit the books — which tells you how long a job like this sits in pre-application review before a shovel gets anywhere near the site. 809 Madison sits in the middle of the Upper East Side's Madison Avenue retail and mansion corridor, a few blocks from the Whitney and inside one of the more heavily landmarked stretches of Manhattan.

DOB's own record doesn't say what's going up or how many floors are being added — just that the horizontal and vertical envelope is changing. That's worth watching, because an expansion filing at a Madison Avenue address this size almost always means an LPC application is sitting somewhere behind it, the same choke point that's holding up Brooklyn's Ritz-Carlton conversion at the Hotel Bossert this month.

For GCs and subs, this is an $11.98 million general-construction package with a contractor already named — not a bid opportunity. But it's a data point on where Macklowe is spending, and a reminder that Upper East Side landmark-district jobs move on Landmarks Preservation Commission time, not DOB time. If you're chasing subcontract work under CM and Associates on this one, the DevHUB timeline says don't expect mobilization soon.

Source: NYC Department of Buildings permit records, issued September 18, 2026.