Last updated: May 23, 2026
What this is
StabilizedNYC is a free tool for NYC renters, published by Hakko Labs LLC. You enter your address; it summarizes what public records say about whether your building is rent-stabilized, until when, and what to do next. It is not a substitute for your DHCR rent history or for legal counsel — it exists to help you ask better questions of both.
How it works
We resolve your address to a 10-digit BBL (Borough-Block-Lot), then consult a handful of city and state datasets to identify stabilization-triggering tax abatements (421-a, J-51, 421-g), pre-1974 ETPA presumption, building class signals, and the most recent DHCR-registered stabilized-unit count. We surface the reasoning so you can see why we said what we said.
Every verdict is reproducible from the listed data sources below — we don't add anything beyond what's already in the public record.
Data sources
| Source | Dataset ID | What we use it for | Refresh |
|---|---|---|---|
| NYC Planning GeoSearch | geosearch.planninglabs.nyc | Address → BBL + BIN + lat/lng | Live |
| NYC DOF Property Tax Exemptions | muvi-b6kx | 421-a / J-51 / 421-g detection; abatement start year and duration | Annual (DOF) |
| NYC PLUTO (24v3) | 64uk-42ks | Year built, residential unit count, building class, owner name | Annual (DCP) |
| NYC Planimetric Building Footprints | 5zhs-2jue | BIN ↔ BBL crosswalk | Periodic |
| HPD Multiple Dwelling Registrations | tesw-yqqr | Current HPD registration status and dates | Daily (HPD) |
| HPD Registration Contacts | feu5-w2e2 | Corporate-owner name, head officer | Daily (HPD) |
| HPD Housing Maintenance Code Violations | wvxf-dwi5 | Open / closed violation counts and recent details | Daily (HPD) |
| HPD Housing Maintenance Code Complaints | ygpa-z7cr | Last-12-month complaint counts and recent details | Daily (HPD) |
| HPD Speculation Watch List | adax-9mit | Recent sale price and cap rate (for buildings on the list) | Quarterly (HPD) |
| JustFix rentstab_v2 (2024 vintage) | justfix-data S3 | DHCR-registered stabilized-unit counts derived from DOF tax bill PDFs | Annual (JustFix) |
Caveats we don't paper over
- Pre-2019 high-rent vacancy deregulation is invisible in public data. A building or unit could appear "stabilized" in our snapshot but have been deregulated by a previous landlord. The only authoritative source per-unit is your DHCR rent history.
- Unit-level status isn't visible. DHCR lists tell us how many units in a building are stabilized; they don't tell us which ones.
- Co-op and condo buildings can have rent-stabilized sponsor units even when most units are owner-occupied. We route these to "unknown — request rent history" rather than guess.
- Data lag. Most sources are days to months old. The JustFix vintage covers up through 2024; abatements granted in 2025 or 2026 may not appear yet.
Report incorrect data
If something on a building's page looks wrong — an owner LLC that was sold, a violation that was vacated, a stabilization status that doesn't match your lease — email contact@stabilized.nyc with the address and a brief description of what's off. We typically acknowledge within a few days. When the upstream source has corrected the underlying record, our data picks up the correction at the next refresh.
Attribution
StabilizedNYC builds on the work of NYC Open Data, NYC Planning Labs, NYS HCR, and especially JustFix, whose open scraping work makes DHCR registry data accessible at all.