About BlockBook

BlockBook is a free property research tool for New York City. Type any NYC address and get the official public record for that building — size, stories, year built, lot dimensions, unit count, zoning, floor area ratio (FAR), the city's assessed value, annual property taxes, and rent-regulation indicators — plus a full mortgage calculator that uses those real numbers instead of guesses.

Where the data comes from

Everything shown on this site comes from official City of New York public data:

• NYC Department of Finance — property tax assessments, taxable values, tax classes, and building characteristics.
• NYC Department of City Planning (PLUTO) — lot and building geometry, zoning districts, FAR, year built, and unit counts.
• NYC GeoSearch — the city's official geocoder, used to match the address you type to its exact tax lot (borough-block-lot).
• Local Law 7 & exemption data — used to flag buildings that are or are likely to be rent-regulated.

How taxes are shown

The annual tax figure is the city's current taxable value multiplied by the official tax rate for the property's class. It reflects public assessment records, not the owner's actual bill — abatements and exemptions (421-a, J-51, co-op/condo abatement, STAR) can lower what is actually paid.

Coverage

BlockBook covers the five boroughs of New York City: Manhattan, Brooklyn, Queens, the Bronx, and Staten Island — roughly 860,000 tax lots. Addresses outside NYC are not supported.

Questions or corrections? Contact info@blockbook.nyc.