Built on the Los Angeles open-data portal

The datasets behind a Los Angeles report

Everything this product says about a Los Angeles building is read from public records published by the City of Los Angeles and the Los Angeles County Assessor on data.lacity.org — read live, attributed on every line, and never resold as anything but what it is. This page lists the datasets we read most, each linked to the publisher's own page for it. Those bodies do not produce, review or endorse this service.

Plus federal context named where it appears — FEMA flood zones, USGS seismic data, census figures, FCC broadband, the National Register — and OpenStreetMap for the maps. How current each feed is running is public too: the source health page.