C4-4L Zoning District — New York City

The construction record on lots carrying this designation shows real recent activity layered on an old base: 75% of recorded buildings predate 1940, with a median construction year of 1931, but 19% have gone up since 2000 — a substantial share of new building on top of an already-established stock. The 1945-to-1975 boom contributed comparatively little, just 3% of the recorded buildings, meaning most of the change to this stock in the twentieth century happened before or after that window rather than during it. That pattern — a real recent-construction share arriving well after the postwar boom had already passed — distinguishes this designation from ones where construction either stopped early or continued in a steady, uninterrupted line.

By land use, mixed residential-commercial buildings account for 38% of recorded parcels, commercial-and-office uses add 14%, and one- and two-family buildings contribute a further 13%. Among recorded building classes, mixed residential-commercial structures make up 27% of the stock and two-family homes 12% more. Residential lots make up 65% of the total, and the file counts 2,433 homes across the roughly 340 lots carrying this designation. That composition, weighted toward mixed residential-commercial use rather than a single-family pattern, is consistent with a designation that has kept attracting new construction rather than one that filled in once and stood still.

The lots run a median of 2,500 square feet, with the 90th percentile reaching 9,356 square feet. Buildings run to a median height of 3 stories, and 7% of the recorded stock rises above 6 floors. None of these lots are recorded inside a designated historic district, and none sit within the mapped federal flood zone. Those modest, consistent lot dimensions leave relatively little room for individual parcels to vary widely from the designation's overall pattern, even as new construction continues to arrive.

The development ledger shows broad recorded slack: 89% of lots record floor area below their allowance, with a median residual of 2.3 FAR — a real gap even with a fifth of the stock built in recent decades. Given how much of the recorded recent construction already appears in these figures, whatever unbuilt capacity remains is likely to keep attracting further building activity rather than sitting untouched the way it might on a designation whose recent-construction share was closer to zero. What a given parcel may still add is a matter for the rules tables above, cited there lot by lot.