Knowledge
Each source has a page with its publisher, update schedule, coverage, known limits, and request fields. Coverage tells you where a source is available, not which fields a property will return. You can get the same details as JSON at /api/knowledge/data-sources.
Last verified . That is when this list was last rebuilt from the ParcelOps source registry, not when each publisher last refreshed its own data.
County-level residential building-permit authorizations, units, and construction value.
Airports, runways, obstacles, and class-airspace context around a proposed site.
Official tract-level Qualified Opportunity Zone designation evidence.
