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Building Footprints
The New York City Office of Technology and Innovation Geographic Information Systems team maintains Building footprints. See this repository for details and some sketchy but current metadata.
https://github.com/mattyschell/geodatabase-buildings
This dataset includes small placeholder triangular building footprints that are marked, appropriately enough, with the feature code "placeholder" (feat_code=1003) Most users will want to filter these triangles out of the building footprints before use.
The Office of Technology and Innovation also maintains a dataset of historic building footprints where demolished buildings are interred. Use care when using this dataset, it lacks strict constraints and quality assurance. It is intended for more fuzzy general
Refreshed every weekend.
Building: https://nyc.maps.arcgis.com/home/item.html?id=870bf69e8a8044aea4488e564c0b4010
Building_Historic: https://nyc.maps.arcgis.com/home/item.html?id=780dd00c689f444cb20070185fada44d
The Geographic Information Systems team publishes a slightly processed version of their internal buildings data to the Open Data Portal weekly.
Building: https://data.cityofnewyork.us/Housing-Development/Building-Footprints/nqwf-w8eh
Building_Historic: https://data.cityofnewyork.us/Housing-Development/Building-Footprints-Historical-Shape/s5zg-yzea
Microsoft released an ODBL-licensed nationwide building footprint dataset.
https://github.com/Microsoft/USBuildingFootprints/
The format is GeoJSON and downloads are chunked by state. To clip New York City and output a shapefile, ogr2ogr is always a solid option.
ogr2ogr -f "ESRI Shapefile" nyc.shp NewYork.json -clipsrc -74.3027914 40.4681991 -73.61703247 40.97574288
The Fire Department of New York City maintains a similar internal, not public, database of building footprints. It contains additional info like building plans that are critical to the Fire Department.