flatcheck
Last updated: July 16, 2026
flatcheck helps NYC renters check a building's public record before they rent. No accounts, no personal information collected, no browsing-history tracking, no ads, no data sold.
On a StreetEasy building or listing page, the extension reads FROM THAT PAGE ONLY: the building's address and any listing fee information shown (to check for possible FARE Act fee issues). It does not read other sites, your history, your accounts, or anything you type.
The building address (and, when shown, the listing's fee text) is sent to the flatcheck API to fetch a public-record building report — HPD violations, bedbug filings, evictions, complaints, registered landlord, unit count — and to flag fees that may not be permitted under the NYC FARE Act. Lookups use public NYC Open Data.
Reports are cached by the building's public BBL (contains public records, not personal data). We may record aggregate, non-identifying usage counts (no IP, no account, no personal identifiers).
If you choose to rate a report, you can submit thumbs up or down on the website or in the extension. Optional comments are stored with your rating so we can improve the product. We do not ask for your name, email, or other personal information with feedback.
No accounts or logins. No tracking of your browsing or the listings you view. No advertising. No selling or sharing of data. No collection of names, emails, payment info, or precise location.
To produce reports, flatcheck queries NYC Open Data (Socrata) and NYC GeoSearch for public records, and may use the Anthropic API for an optional plain-language report summary. Only building/public data is sent to these services — never personal information about you.
The extension requests access to streeteasy.com (to read the listing address/fees on pages you open) and to the flatcheck API (to fetch reports), used only for the above.
We'll update this page if practices change, with a new “last updated” date.
Questions: flatchecknyc@gmail.com.