Questions about the map, the data and the pages.

New York City, all five boroughs: every tax lot, every building footprint the city has surveyed, and every condominium apartment its records make addressable. That is 857,347 lots, 1,083,016 buildings and 3.7 million homes of record, on 995,043 pages. The coverage page shows the live counts and is generated from the same records the map reads.

Almost always because it is outside New York City - the map is the five boroughs today and nothing beyond them yet. Within the city, a number of lots have no addressable building in the city's own records and therefore get no page: piers, park slivers, and lots whose files disagree about where they are. Those refusals are deliberate, and the coverage page explains the test.

Yes. Type a street and number into the box at the top of the map, or go straight to the URL - every address has a permanent, readable one of the form `/us/ny/manhattan/west-village/spring-street/144`. Get the neighborhood wrong and you are redirected rather than shown a 404.

Because we do not hold the rights to any, and we will not generate one. A picture of the wrong building next to a correct sale price teaches you that our facts are approximate too. What a building page shows instead is the real footprint extruded to the real roof height the city measured, which is a drawing of facts rather than a picture of a place nobody photographed.

Four files the City of New York publishes: the tax lot file for zoning, land use and lot size; the building footprint file for outlines and roof heights; the address file for street names and house numbers; and the register of recorded documents for sales. The coverage page names each one and says where each is known to be wrong.

It probably is, and it is probably the city's own value. Between 1910 and 1985 most year-built values in the city's records fall on years ending in 5 or 0, and many nineteenth-century buildings are recorded as 1899, 1900 or 1901. Treat it as reliable to the decade, which is what every building page says next to the number.

Because a deed is recorded against a tax lot, not against an apartment. Where a sale covers the building or the lot rather than the unit you are looking at, the page says so directly under the price. On a condominium billing lot one deed can cover several buildings, and hiding that would be tidier and wrong.

New York State treats a recorded consideration of ten dollars or less as a transfer rather than a sale - a gift between family members, a correction, a restructuring. Those rows are shown so the record can be reconciled against the city register, labelled, and kept out of every median. Applying that one test moved the median arm's length Manhattan sale from 4.4 million dollars to 1,400,094.

No, and there will not be. A valuation is a claim about somebody's money, and this site publishes the public record instead. What is coming in the next phase is the asking price every portal is showing for the same home, side by side with its history - a fact rather than a guess.

Tell us the page, the fact, and the city record that shows what it should say. Corrections go to the front of the queue and always get a reply. Where the error is in the city's own file we will say so and show you where to correct it at the source, because that is the only fix that lasts.

The facts here - a lot's zoning, a building's height, a recorded deed - are public records that the City of New York publishes and that anyone can download. We do not hold or publish anything about who lives anywhere. If you believe a specific page creates a safety risk, write to us and say what and why; we read those first.

There is no personal data here to sell. The site stores nothing about you beyond the cookie choice you make, and the analytics that run are subject to it - the details are in the cookie policy under Legal.

The underlying records are the city's and are public. Our arrangement of them, the pages and the explanations are ours - the terms are under Legal. If you want the data in bulk rather than a page at a time, ask: that is a real conversation and not a scraping problem.

Not a public one yet. There is a machine-readable map of the site at `/llms.txt`, every page returns clean Markdown to a request carrying `Accept: text/markdown`, and there is a read-only search endpoint described in the OpenAPI document. A full read API over the same contract the site uses is planned.