Data attributions

Every feed behind the product, with the attribution its terms require or courtesy suggests. Per-source cadence, vintage, and coverage: data sources. Upstream terms pass through to you — bulk redistribution of served data is prohibited (terms §4).

Government / open data — Cook County Assessor, Clerk, Treasurer, and Board of Review (public records via the Cook County open-data portal) · Chicago Data Portal (permits, licenses, 311, crime, violations, zoning — City of Chicago data terms, full statement below) · Lake County IL GIS & Recorder (per-layer export terms) · U.S. Census Bureau (ACS, LEHD/LODES, TIGERweb, BPS — API disclaimer below) · HUD (SAFMR, FMR, income limits) · CFPB/FFIEC HMDA · FEMA (NFHL, NFIP, NRI) · CTA ridership.

Commercial / licensed — Photos: Street View imagery © Google — served under the Google Maps Platform terms via the licensed Static API; Google’s in-image attribution is never cropped or obscured · Zillow Research — ZHVI (typical home value) and ZORI (typical rent), under Zillow’s data terms; see zillow.com/research/data · RentCast — interim licensed listings feed (sale listings, condo/townhome coverage), served under the RentCast API terms; see rentcast.io · Redfin Data Center (market statistics).

Infrastructure — Map: © OpenStreetMap contributors (openstreetmap.org/copyright, ODbL), tiles served via OpenFreeMap, rendered client-side with MapLibre · Geocoding: Nominatim / OpenStreetMap (per the OSM Nominatim usage policy) · Routing: OSRM.

Planned (attribution added before first use) — DePaul Institute for Housing Studies · FHFA.

Required source statements

Reproduced verbatim, as required or requested by the source.

City of Chicago (Chicago Data Portal — permits, licenses, 311, crime, violations, zoning):

This site provides applications using data that has been modified for use from its original source, www.cityofchicago.org, the official website of the City of Chicago. The City of Chicago makes no claims as to the content, accuracy, timeliness, or completeness of any of the data provided at this site. The data provided at this site is subject to change at any time. It is understood that the data provided at this site is being used at one’s own risk.

U.S. Census Bureau (ACS, LEHD/LODES, TIGERweb, Building Permits Survey):

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Canonical attribution strings, where a surface needs the short form: “© OpenStreetMap contributors” · “Photos © Google” · “Data: Cook County, City of Chicago, Lake County IL, U.S. Census Bureau, HUD, CFPB/FFIEC, FEMA, CTA” · “Listings: RentCast”.

Automated valuations are not appraisals (AVM disclosure). No FCRA-regulated use. Bulk redistribution of served data prohibited; attribution required when quoting derived analysis.