CoStar API
No public API for CoStar Suite, COMPS, Market Analytics, or LoopNet data, and the Terms of Use prohibit any automated extraction; CoStar has sued scrapers under the CFAA. Real Estate Manager integrations exist but are built by CoStar professional services, not exposed as a self-serve API.
Frequently asked questions
CoStar scores F on the API Report Card. No public API for CoStar Suite, COMPS, Market Analytics, or LoopNet data, and the Terms of Use prohibit any automated extraction; CoStar has sued scrapers under the CFAA. Real Estate Manager integrations exist but are built by CoStar professional services, not exposed as a self-serve API.
Without a usable official API, teams fall back on manual exports, file drops, or one-off vendor integrations. The other option is an unofficial API layer like Supergood that automates the authenticated web app directly.
CoStar is the flagship CRE information platform from CoStar Group, Inc.
Real Estate, specifically the entire institutional and professional commercial real estate stack. CRE brokers and analysts spend hours daily in CoStar Suite searching properties by submarket, asset class, ownership, and tenancy; pulling lease and sale comps to support BOVs, valuations, and pitch decks; running market analytics for rent growth, absorption, vacancy, and cap rate trends; building tenant prospect lists; tracking lease expirations on competitor buildings; and generating PDF reports for clients.
Very high in commercial real estate.
CoStar holds the canonical record of the U.S. and U.K. commercial real estate market: building-level property data (address, RBA, year built, owner, sales history) for every CRE asset; lease comps with rent, term, concessions, escalations, and tenant identity; sale comps with price, cap rate, buyer, seller, and broker; tenant directories with industry, square footage occupied, and lease expirations; submarket-level rent growth, vacancy, absorption, and supply forecasts; multifamily property and rent data via Apartments.com; CRE marketplace listings via LoopNet; and STR-level hospitality benchmarks.
Mature, research-heavy data platform with steady but conservative modernization.
CoStar Terms of Use explicitly prohibit any automated extraction, scraping, robots, or data-mining tools, making any programmatic access to a customer's own search results legally risky. CoStar has filed major federal lawsuits (CREXi, Xceligent, Happening, Baron Realty) against competitors and customers for high-volume or automated access, chilling any unofficial integration work. Full sourced list under Sources below.
Common alternatives include CompStak, Reonomy (Altus Group), CREXi, Real Capital Analytics (MSCI), CoreLogic, CRED iQ. Graded alternatives appear under "More from the report card" below.
Grades measure one thing: can a customer's engineering team get their own data out programmatically? We check six things (whether a real API exists, how access is gated, data coverage, auth quality, docs and developer experience, and stability) and roll them into a letter grade. Grades get re-verified, and they only move on evidence.