Editorial
Corrections
A site built by joining public files together will get some of them wrong. This page is where that is recorded, in public, including the defects found before anybody else could see them.
Last reviewed 4 September 2026
Reporting an error
Use the contact form with the page address and what looks wrong. The most useful reports name the building and say what the correct figure is, ideally with the document or the agency record it comes from.
Three kinds of error
They are handled differently, so it is worth separating them.
- An error made here. A figure misread, a document attached to the wrong building, a total that does not add up, a description that misstates what a code means. These are defects in this publication. They get fixed and logged below.
- An error in the City's file. A consideration typed with an extra digit, a year built that is plainly wrong, a unit count that does not match the building. This site reproduces what the agency published. The fix is a filing with the agency, and this site carries the corrected version at the refresh after the source does.
- A disagreement about what the record means. A recorded consideration that was not a market price, a transfer between related parties. The record is not wrong; it is being read as something it is not. The guide to reading a sale history exists for this case.
What cannot be changed here
Records are not removed on request. A publication of public records that deletes rows when asked is no longer a record of anything, and the request is usually better addressed to the agency that created the entry. The privacy page sets out the narrow circumstances in which a page is reconsidered, and explains why owner names do not appear here in the first place.
The log
Data on this site was retrieved on 2026-09-04. Entries are newest first.
Follow the record
A note when the files are refreshed
A short note when the City's files are refreshed and this site is rebuilt: what changed in the record, what was found wrong here and fixed, and anything new in the guides. Occasional. It goes out when the data does, which is not on a schedule.
2026-09-04 / Every condominium building page
What was wrong. The first version of the join attached transfers to a lot by exact match on the borough, block and lot recorded in ACRIS. That is correct for co-operatives and rentals, where the building is one tax lot, and silently wrong for condominiums, where the Department of Finance issues each apartment its own unit lot but PLUTO describes the building at a separate billing lot. Every condominium in the city would have shown an empty sale history while looking entirely normal.
What fixed it. The Digital Tax Map condominium and condominium unit files are now loaded first and every unit lot is resolved to its billing lot before the join. The result was checked against a building whose unit count is independently recorded in PLUTO: the crosswalk returns exactly the number of unit lots PLUTO records as total units.
2026-09-04 / Every co-operative building page
What was wrong. Restricting transfers to deeds produced empty sale histories for co-operative buildings. A co-operative apartment sale conveys shares in a corporation, so no deed is recorded; the instrument filed is a Real Property Transfer Tax return.
What fixed it. Transfer tax returns are now carried alongside deeds, and the instrument is named in the last column of every sale table so the two are never confused.
2026-09-04 / Sale history tables, all pages
What was wrong. Including every residential property type pulled in parking spaces, storage rooms and maid's rooms. Those are genuine recorded transfers at prices that have nothing to do with the price of a home, and they dragged medians down without describing anything a reader was looking for.
What fixed it. Those property types are excluded and the exclusion is stated on the methodology page and in the ACRIS guide.
Related: Methodology and sources, About.