M1-5/R9X Zoning District — New York City

At roughly 170 tax lots, this is the largest footprint of its family profiled here, and scale is not the only extreme it carries: the median construction year is 1876, the oldest in this comparison set, with 93% of recorded buildings predating 1940 and just 5% built since 2000. The 1945-to-1975 postwar boom contributes 0% of the stock — the same complete absence of boom-era construction seen elsewhere in this family, but paired here with a much older median year. A footprint this large carrying an age profile this old means the pattern holds across genuine citywide scale rather than a handful of parcels, unlike some of the smaller designations profiled alongside it where a single lot can swing the percentages.

Historic-district status is close to universal here: 97% of these roughly 170 lots carry it on record, among the highest overlaps of any designation in this comparison set. Office buildings lead the recorded building classes at 33%, store buildings follow at 19%, and condominiums add 16% — a mixed commercial-and-housing pattern rather than a single dominant type. Land use runs 42% mixed residential-and-commercial and 41% commercial-and-office, nearly tied at the top, with multi-family elevator use recording 13%, a land-use file that tracks the building-class mix above it closely rather than diverging from it.

Height stays comparatively modest for a stock this old and this landmarked: a median of 5 stories, with 22% of buildings rising above 6 floors. Lot sizes run small — a median of 4,974 square feet, with a 90th percentile of 12,372 square feet — ground consistent with the dense, prewar block pattern the age figures already suggest and among the tighter lot fabrics recorded in this family. Just over half of these lots, 56%, are coded residential, and the file counts 1,881 homes on them, a sizable recorded population for a footprint built this low.

Flood exposure touches a real minority here: 6% of these 170 lots sit inside the mapped federal Special Flood Hazard Area, a statement about the regulatory boundary rather than a record of actual water. The development file shows a broad recorded gap — 88% of lots record floor area below their allowance, with a median residual of 4 FAR — even on ground this densely landmarked, a combination of old age, heavy landmark coverage, and wide recorded headroom that few other designations in this family show together. Each lot's own page carries its specific figures, and the rules tables above set out the governing numbers with their citations.