M1-5B Zoning District — New York City

The ground beneath this designation is the tightest recorded of its family: a median lot of just 2,420 square feet, with even the 90th percentile reaching only 4,000 square feet — the narrowest spread between median and upper-range lot size of any designation in this comparison set. On parcels this small and this consistent, the recorded stock reads as classic dense rowhouse-and-walk-up fabric rather than anything assembled from larger sites — 95% of these roughly 22 lots are coded residential, among the highest shares in this comparison set, and a scale of consistency that stands apart from the more mixed, larger-lot designations elsewhere in this family and its wider group of pairings.

Walk-up apartment buildings lead the recorded building classes at 45%, one-family homes follow at 18%, and condominiums add 14% — a housing mix built for density on small ground. Land use matches closely: mixed residential-and-commercial use covers 43% of these lots, multi-family walk-up use another 29%, and one- and two-family use 19%, a land-use file that tracks the building-class order above it almost exactly. The file counts 332 homes across the roughly 22-lot footprint, a real population for so small and tight a recorded fabric, and one that implies multiple recorded units on a meaningful share of these small parcels rather than single-family use throughout.

The age record leans old with real recent addition: the median construction year is 1903, with 73% of buildings predating 1940, none, 0%, falling inside the 1945-to-1975 postwar boom, and 27% built since 2000 — recent construction filling in where the boom years left nothing, a pattern that echoes the two-era split seen on some of the other small-lot designations in this family. Height stays low, a median of 5 stories with 14% of buildings rising above 6 floors, consistent with the walk-up pattern the class file already shows leading.

A substantial 73% of these lots also carry historic-district status on record, layering landmark review onto the small-lot zoning designation for most of the footprint, while 32% sit inside the mapped federal flood zone — a real minority exposure by the regulatory map rather than a record of actual flooding. The file carries no reliable development-capacity coverage for this designation, so no headroom or residual-FAR figure can be cited here, an absence in the record rather than a claim about what could still be built. Each lot's own page carries what is recorded for it individually.