Tax Lots

The Department of Finance maintains Tax Lots in the Property Information Portal (PIP). The Department of Finance publishes these tax lots as a service on the NYCMaps ArcGIS Online organization. The Department of Finance also publishes these tax lots in some form on the NYC Open Data Portal.

Property Information Portal (formerly Digital Tax Map)

https://propertyinformationportal.nyc.gov/

NYCMaps ArcGIS Online

This is what you want.

Item Page

• https://nyc.maps.arcgis.com/home/item.html?id=fabad80e6d19499ca63bb95954eee009

REST Service

• https://services6.arcgis.com/yG5s3afENB5iO9fj/arcgis/rest/services/Tax_Lot_View/FeatureServer

NYC Open Data

Tax Lots can be difficult to find on Open Data because they're hidden inside a zip file in the "Department of Finance Digital Tax Map" dataset. Historically the NYC Office of Technology and Innovation loaded this dataset weekly. It's a big(~500 MB) zip file containing 7 related shapefiles. You may also find a zipped file geodatabase with tax lots somewhere inside the file geodatabase.

Polygonal tax lots are inside the zip file and named like "DTM_Tax_Lot_Polygon." Do not be fooled by the shapefile "DTM_Tax_Lot_Face" which describes lines around tax lots. Unless you are a tax map wizard you probably do not want to look at these lines.

More (outdated) metadata here: https://github.com/CityOfNewYork/nyc-geo-metadata/blob/master/Metadata/Metadata_DigitalTaxMap.md