M1-9A/R12 Zoning District — New York City

This designation carries real recorded headroom at a meaningful scale. Across roughly 290 tax lots, 84% record floor area below their allowance, with a median residual of 4.3 FAR — broader coverage and a deeper gap than many designations in this file can show, and a scale large enough that the figure describes a genuine pattern rather than a handful of parcels. On a corridor built mostly for office use, that headroom describes buildings that have not been expanded to their full recorded allowance rather than vacant ground; the specific figure this designation permits, with its citation, sits in the rules tables above. A file this large, at 290 lots, also means the 84% figure is unlikely to be an artifact of a handful of atypical parcels.

The recorded stock leans prewar but is not frozen in place. The median construction year is 1924, and 86% of buildings predate 1940, while only 3% fall inside the 1945-1975 postwar boom. Since 2000, though, 11% of the recorded stock has gone up — a comparatively active recent share for a designation this old at its core, suggesting the corridor has kept adding new buildings even as its prewar majority holds, rather than settling into the near-total stasis some older commercial designations in this file show.

By recorded class, office buildings lead at 56%, with store buildings at 17% and hotels at 7% — a corridor mixing workplace, retail, and lodging uses rather than a single-purpose office file. Land use tells the same story: commercial and office parcels cover 76% of the file, mixed residential-and-commercial use another 15%, and industrial and manufacturing use just 2%. Height runs to a median of 12 stories, with 62% of recorded buildings above 6 floors — tall, though somewhat less so than the taller office designations nearby, consistent with a corridor built up over a longer stretch of time. That blend of office, retail, and lodging classes also matches the modest but real residential share described below, rounding out a corridor built for more than one purpose at once.

Only 17% of these lots are recorded as residential, yet the file counts 7,441 units — a large number concentrated on a minority of the parcels, echoing the same pattern of tall buildings carrying most of the recorded housing seen on related designations in this batch. Lots themselves run tight, a median of 4,906 square feet with a 90th percentile of 12,343 — a narrower spread than the mostly industrial designations elsewhere in this batch, consistent with a corridor built up parcel by parcel rather than through large assemblages. None of the lots, 0%, sit inside the mapped federal flood zone, and none carry historic-district status on record — a corridor whose only recorded overlay, so far as this file tracks, is the headroom described above.