Allerton, The Bronx

Allerton's roughly 1,600 tax lots carry 24,494 recorded housing units between them, a density that outpaces several larger Bronx neighborhoods on a per-lot basis and stands out even among the pages covered in this set. Building classes reflect that intensity: 41% of lots are classed two-family and 26% walk-up multi-family, with only 13% single-family — a different mix from the one- and two-family blocks that dominate much of the surrounding area. Where nearby sections read as low-rise subdivisions, Allerton's file describes a denser, more varied building stock packed onto a comparatively small footprint, a distinction that shows up consistently from the unit count down to the building-class mix carrying it.

The median building here dates to 1945, at the front edge of the postwar boom the records track between 1945 and 1975; 41% of the stock falls inside that boom window, 46% predates 1940, and 7% has gone up since 2000. Land-use coding runs 54% one- and two-family, 25% multi-family walk-up, and 6% mixed residential-commercial, consistent with a neighborhood built out in layers rather than a single wave, where an older prewar core sits alongside a substantial postwar-era addition.

Lots run to a median of 2,500 square feet, but the spread is wide — a lot at the ninetieth percentile reaches 9,692 square feet, well above the typical Bronx block in this set. Development headroom is correspondingly generous: the median lot carries 1 additional FAR of unused capacity, and 87% of lots show some recorded headroom, the widest margin among Allerton and its bordering neighborhoods. Only 2% of buildings are recorded above 6 stories, so that headroom has gone largely unbuilt, leaving the neighborhood's low-rise stock as the norm despite the density the unit and lot-count figures suggest.

The flood maps show 0% of lots in the mapped high-risk floodplain, and no lots carry a historic-district designation, an absence in the record rather than a claim about risk or character. Residential use covers 90% of lots, in a neighborhood bordering Morris Park, Pelham Gardens, Pelham Parkway-Van Nest, and Williamsbridge-Olinville, each carrying its own tax-lot profile. Per-lot figures behind these numbers, including individual headroom and residual FAR, are available through PearlAudit for any address here, which is a finer level of detail than the neighborhood-wide shares above can offer on their own. That gap between a modest parcel count and a comparatively large recorded unit total is the single fact that most distinguishes Allerton's page from its neighbors'.