M1-4/R6B Zoning District — New York City

Residential coding reaches its highest point in this batch on lots carrying this designation: 76% of its roughly 460 tax lots are coded residential, and the file counts 1,921 recorded homes across them — a genuinely housing-dominated stock even though the designation itself pairs a manufacturing base with a residential overlay. That residential weight sits on a stock that is heavily prewar: 83% of recorded buildings predate 1940, at a median construction year of 1931. The 1945-1975 postwar boom left only a 3% mark, and 12% of buildings have gone up since 2000, a slow but real trickle of recent construction rather than none at all.

Walk-up apartment buildings lead the recorded classes at 32%, two-family homes follow at 18%, and mixed residential-and-commercial buildings add 10% — the classic attached-housing mix. Land use tracks closely: multi-family walk-up use covers 37% of lots, one- and two-family use another 23%, and mixed residential-and-commercial use 14%, a land-use file that closely mirrors the building-class mix above it.

Buildings rise to a median of 3 stories, with 0% recorded above 6 floors — a uniformly low-rise stock. Lots run a median of 2,500 square feet, with the 90th percentile reaching 6,720 square feet, tight ground consistent with the attached rowhouse-and-walk-up pattern above and among the smaller recorded lot fabrics in this batch.

Flood exposure here is real, touching 21% of these roughly 460 lots — a larger share than several other designations in this batch record. None of these lots, 0%, carry historic-district status on record, leaving the flood map as the more consequential recorded overlay for this designation.

Development room is the tightest recorded in this batch: 74% of lots do show some floor area below their allowance, but the median residual is just 0.6 FAR, the narrowest gap of any designation profiled here — a stock that is largely built out on the ground it occupies. Each of these roughly 460 lots keeps its own recorded figures individually, and the floor-area and height rules that govern the designation, whatever headroom remains lot by lot, are set out with citations in the tables above.