M1-3 Zoning District — New York City

This designation is mapped across roughly 330 tax lots, and the recorded stock spans construction eras more evenly than most: 53% of buildings predate 1940, 16% fall within the 1945-1975 postwar boom, and 15% have been built since 2000 — three distinct eras each contributing a meaningful share, rather than one era dominating the file. The median construction year lands at 1931, early enough to sit just inside the prewar majority. That even spread across three eras gives this file a more layered construction history than a single dominant build date would suggest.

The recorded building classes describe working ground: garages lead at 25% of tracked classes, warehouses follow at 22%, and factory-and-industrial buildings add 16%. By land use, industrial-and-manufacturing use covers 39% of lots — the largest single category recorded here — with commercial-and-office use at 15% and transportation-and-utility use at 14%, a footprint built primarily around industrial activity rather than housing. Garages, warehouses, and factories leading the building-class file, alongside industrial use leading the land-use file by a wide margin, together describe a footprint built primarily for working and storage purposes.

Just 12% of these lots are coded residential, yet together they still record 1,916 homes across the 330-lot footprint — a meaningful housing total layered onto a footprint whose land use and building classes read overwhelmingly industrial. Lot sizes run to a median of 5,011 square feet, with the 90th percentile reaching 28,750 square feet, a spread wide enough to hold both small working parcels and substantially larger assembled sites. Height stays low: a median of 2 stories, with 11% of recorded buildings rising above 6 floors. A residential share this small still producing nearly two thousand recorded homes suggests those homes concentrate on a limited share of the 330 parcels rather than spreading evenly across the working footprint.

Only 2% of these lots sit inside the mapped federal flood zone on record, a small share, and 0% carry historic-district status. The file carries no reliable development-capacity or headroom figure for these lots, an absence in the record rather than a claim about actual capacity. Between the even split across construction eras, the industrial land use, and the modest flood exposure, this designation's 330 lots describe a working footprint whose age and use are well recorded even where capacity is not. The floor-area and use rules that actually govern this designation are set out, with citations, in the tables above.