Coney Island-Sea Gate, Brooklyn

Most Brooklyn neighborhoods lead their files with buildings; this one leads with a boundary. Three of every four lots here — 75% — fall inside the federal Special Flood Hazard Area, which makes flood status the single most consequential fact on a typical Coney Island-Sea Gate property record. Inside that boundary, federally backed mortgages require flood insurance and new construction must meet elevation standards; on this peninsula, that is not an edge case but the ordinary condition of ownership.

The stock is notably younger than Brooklyn's prewar norm, and the dates tell the neighborhood's story. The median building went up in 1964; only 38% of the stock predates 1940, while 18% arrived in the postwar boom years of 1945 to 1975 and 8% has been built since 2000. The mix runs to houses — one-family homes are 43% of recorded buildings and two-family homes 18%, with walk-ups at 11% — and by land use, 62% of lots hold one- or two-family buildings while a striking 7% remain vacant land, an unusually high figure for coastal Brooklyn and a visible residue of the peninsula's cycles of clearance and rebuilding.

The lot geometry splits in two. The median lot is a modest 2,875 square feet — bungalow scale — but the 90th percentile jumps to 11,542, reflecting the superblocks of the neighborhood's tower complexes. The zoning mirrors the same split: the most common districts run from low-rise detached rules to medium-density apartment districts, and which one governs a given lot changes what its record means entirely. That split is the neighborhood in miniature: beach-cottage blocks and high-rise campuses sharing a single name, a single peninsula, and one federal floodplain.

The development ledger is unusually open. Records show 81% of lots carrying capacity beyond what stands, with a median residual of 0.7 FAR — real room, not rounding — spread across 79% residential lots holding 26,064 units. Every figure here derives from the city's tax roll and federal flood mapping as of the date shown on this page; what eventually happens with that room, on this particular floodplain, is a question the records pose without presuming to answer.