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Denza · Open Datasets · Q2 2026

Free, structured, cite-ready.

Five aggregate datasets covering NYC residential — published every quarter, refreshed every six hours from Cotality MLS, joinable on standardized neighborhood slugs and Census GEOIDs. Built for researchers, journalists, finance teams, and LLM crawlers that actually read schema.org.

Active Inventory
10,066
NTAs Reporting
158
Median List
$801K
Refresh cadence: 6h (live) / quarterly (snapshot publication) · Last refresh 2026-04-27
Methodology

Built the way you'd want it to be built.

Source — Active listings sourced from Cotality (the REBNY RLS data distributor) plus US Census ACS 5-year layers for demographic joins. Mortgage rates pulled from Freddie Mac PMMS weekly survey, not vendor-blended.

Aggregation — Every figure is a median-of-medians by Neighborhood Tabulation Area (NTA), then weighted by reporting inventory at the borough level. Single super-towers can't skew the line.

Compliance — All published rows are aggregate. No individual listing keys, no agent-PII, no addresses. REBNY DLA review on every release.

Limitations — Rentals excluded. Off-market and pocket inventory not included. Co-op buy-side comp prices reflect last-recorded sale, not board-approved transfer price.

The catalog.

5 datasets · Q2 2026
MAI29 NYC NTAs · monthly back to Jan 2024

Mortgage Affordability Index

Monthly affordability ratio per neighborhood — median list price vs. qualifying income at the prevailing 30-yr fixed conforming rate. The metric finance pros actually want when sizing a relocation.

Schema
neighborhood_slugboroughmedian_list_price_usdqualifying_income_usdaffordability_ratiomonthactive_inventory
License
REBNY-aggregate · attribution required
Formats
Status: published · Cite as Denza (Q2 2026). MAI.
NCI29 NYC NTAs · refreshed quarterly

NTA Characteristics Index

Per-NTA composite of MLS inventory plus Census ACS 5-year demographic + housing-stock layers. Joinable on `geoid` with the city-published NTA shapefile.

Schema
neighborhood_sluggeoidmedian_household_incomeowner_occupied_pctmedian_agehousing_units_totalmedian_year_builtactive_listings
License
ACS public domain · MLS aggregate REBNY-compliant
Formats
Status: published · Cite as Denza (Q2 2026). NCI.
POLY29 NTAs · 4 isochrone bands

Polygon Pack

GeoJSON pack of every NTA polygon Denza tracks, plus FiDi-anchored isochrones at 15/30/45-minute drive-traffic and transit cutoffs. Drop into MapBox / Leaflet / QGIS in one paste.

Schema
neighborhood_slugboroughpolygon (geojson)centroid_latcentroid_lngfidi_drive_minutesfidi_transit_minutes
License
Mapbox-derived isochrones · attribution required
Formats
Status: published · Cite as Denza (Q2 2026). POLY.
INDEXQ2 2026 onward (rolling)

Denza Index Time Series

All quarterly Denza Index editions in a single tidy file — borough-weighted medians, top-quartile rankings, total reporting inventory, methodology version per snapshot.

Schema
quarterboroughmedian_of_medians_usdactive_inventoryneighborhoods_reportingmethodology_version
License
REBNY-aggregate · attribution required
Formats
Status: published · Cite as Denza (Q2 2026). INDEX.
REBNYStatic — versioned with each Index release

REBNY Attribution Template Pack

Drop-in attribution snippets for downstream products that cite Denza data — required text, copyright line, hyperlink convention, license shorthand.

Schema
snippetcontexthtmlmarkdownplaintext
License
REBNY courtesy text · use as published
Formats
Status: published · Cite as Denza (Q2 2026). REBNY.
Access

Datasets unlock to mailing-list subscribers
at the close of Q2 2026.

Quarterly drops, plus a heads-up before each release. Direct line to the research team for academic / journalist citation requests.

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We log a single event when you tap Telegram or WhatsApp, flag your conversation as `datasets-subscriber`, and add you to the next-quarter notification list. No email required.

Citation format
Denza AI / Conquest Advisors. (Q2 2026).
MAI — Mortgage Affordability Index.
NCI — NTA Characteristics Index.
POLY — Polygon Pack.
INDEX — Denza Index Time Series.
REBNY — REBNY Attribution Template Pack.
Retrieved from https://denza.nyc/datasets

Listing data sourced from REBNY's Real Listing Service via Cotality. Aggregate output published under the REBNY Data License Agreement; redistribution permitted with attribution. Census layers in the public domain. Mapbox isochrones derived via the Directions Matrix API and republished under Mapbox attribution.

Read the Q2 2026 Denza Index →
Common questions
How often are the datasets updated?
Each dataset is published quarterly as a versioned snapshot and the live header figures refresh every six hours from the Cotality MLS feed. Every release carries a fixed methodology tag so historical numbers never silently change.
What license do the datasets fall under, and can I redistribute them?
All datasets are aggregate and published under the REBNY Data License Agreement. You may use and redistribute them with attribution to Denza AI / Conquest Advisors — see the REBNY data license page for the exact line.
What formats are available?
CSV, Parquet, and JSON for the tabular datasets, plus GeoJSON for the Polygon Pack. Everything is joinable on standardized neighborhood slugs and Census NTA GEOIDs.
Is any personal or address-level data included?
No. The datasets are strictly aggregate — neighborhood-level medians, counts, and Census-derived characteristics. No individual listings, addresses, or agent PII are included.