Williamsbridge-Olinville, The Bronx

Most Bronx neighborhoods gathered here show only a trickle of construction since 2000; Williamsbridge-Olinville's 11% share is the highest of them, even while 48% of its recorded buildings predate 1940 and the median building dates to that same year, 1940. Another 36% falls inside the postwar boom between 1945 and 1975, so the neighborhood's roughly 6,200 tax lots carry three distinct building eras rather than one dominant wave. That layering — an older prewar core, a substantial midcentury addition, and a modest but real recent slice — is unusual enough among its neighbors to be the clearest thing the age columns show. Few of the neighboring Bronx pages carry that same three-era split in anywhere near the same proportions.

Building classes lean toward two-family and walk-up stock: 42% of lots are classed two-family, 26% walk-up multi-family, and 19% one-family. Land-use coding runs 61% one- and two-family use, 26% multi-family walk-up, and 4% mixed residential-commercial. Lots run to a median of 2,500 square feet, with a lot at the ninetieth percentile reaching 5,164 square feet — a narrower spread than some neighboring blocks, suggesting a more evenly platted subdivision underneath the mixed-era building stock, one that filled in gradually rather than all at once.

Development headroom sits at 77% of lots carrying some unused capacity, with a median residual FAR of 0.5. Only 1% of buildings are recorded above 6 stories, and none carry a historic-district designation, so height and landmark protection both stay minimal across the neighborhood. The flood maps show 0% of lots in the mapped high-risk floodplain, a statement about the current regulatory map rather than a claim about the land itself. Taken together, the flood and historic-district readings describe a neighborhood governed almost entirely by its zoning envelope rather than by overlay protections, leaving the district's own bulk rules as the primary constraint the records show for any given lot.

Residential use covers 92% of lots, holding a recorded 23,875 housing units across the neighborhood's roughly 6,200 parcels. Williamsbridge-Olinville borders Allerton, Eastchester-Edenwald-Baychester, Norwood, Pelham Gardens, and Wakefield-Woodlawn — five neighborhoods whose own records are profiled separately on these pages, each with a distinct construction-era mix of its own. Individual lot detail, down to construction year and residual FAR, is searchable address by address, giving a finer read than any neighborhood-wide share can provide on its own, particularly where three different building eras sit within the same set of blocks. No single decade of the file's construction-year record dominates the way it does in some of the surrounding sections.