Riverdale-Spuyten Duyvil, The Bronx

Riverdale-Spuyten Duyvil's tax-lot file runs to roughly 3,000 parcels, built up predominantly with one-family homes: 51% of recorded buildings fall into that class, well ahead of two-family homes at 16% and vacant-land classifications at 11%. The land-use file tells a similarly single-family story, with 67% of lots logged for one- and two-family use, 11% still recorded as vacant land, and just 7% logged for multifamily walk-up use. That land-use pattern leaves comparatively little of the file recorded as multifamily or commercial altogether, reinforcing a neighborhood built primarily around single-lot houses. That combination of scale and low-density land use describes a file dominated by detached and semi-detached houses on individual lots rather than multifamily buildings.

Construction dates split close to evenly between two eras: 48% of recorded buildings predate 1940, and the median construction year for the neighborhood is 1940 itself — right at that dividing line. The 1945-to-1975 postwar boom accounts for 30% of the stock, a substantial share layered on top of the earlier build-out, while just 7% of buildings have gone up since 2000. Recorded development capacity runs moderate: 73% of lots carry floor area below their district allowance, with a median residual FAR of 0.4.

Median lot size runs to 5,000 square feet, with the largest recorded parcels reaching as high as 24,675 square feet. Floors run to a median of 2, and 3% of recorded buildings rise above 6 stories, consistent with a neighborhood built mostly of detached houses. 82% of lots are logged as residential, carrying 23,501 housing units. A recorded historic-district designation covers 9% of Riverdale-Spuyten Duyvil's lots, and the mapped floodplain share stands at 1% — both statements about the current regulatory record rather than judgments about the neighborhood's character or its distance from water.

The neighborhood's mapped zoning runs almost entirely to low-density residential districts built for detached and semi-attached houses, matching the one-family land use dominating its file. Riverdale-Spuyten Duyvil's only bordering neighborhood in this set of files is Kingsbridge-Marble Hill to the south, across a landscape that shifts from larger single-family lots toward the denser, smaller-lot blocks nearer the Harlem River.

Taken together, the historic-district share and the one-family building concentration describe a neighborhood built around larger lots, lower floor counts, and a construction record split nearly in half between prewar and the postwar decades that followed it. Per-lot construction-year, building-class, and capacity detail are available individually for each of these roughly 3,000 parcels rather than only as this neighborhood-wide summary.