CoStar Group provides commercial real estate data, analytics, and online property marketplaces, and is expanding into residential real estate portals. The company's flagship product is the CoStar Suite, a subscription platform giving CRE professionals access to a proprietary database covering leasing and sales comparables, tenant data, vacancy rates, and market analytics. CoStar Suite is the industry standard for CRE professionals in the U.S. and select international markets, with high switching costs given deep workflow integration. LoopNet is CoStar's commercial property marketing marketplace, where landlords and brokers pay to advertise properties to tenants and buyers. On the residential side, Apartments.com is the leading U.S. apartment rental marketplace, where property managers pay to list communities and renters search for free. Homes.com is a recently relaunched for-sale residential portal operating on a "your listing, your lead" model, where agents pay for memberships and listing promotion, and all leads go directly to the listing agent rather than competing buyer agents. CoStar also owns OnTheMarket in the UK and Domain, Australia's second-largest residential portal, acquired in 2025. Revenue is primarily subscription-based, with fixed monthly fees rather than per-click or per-transaction pricing. The commercial segment runs at roughly 47% adjusted EBITDA margins, while the residential segment is still in investment mode. CoStar sells through a direct sales force of over 2,000 representatives. Key growth priorities include scaling Homes.com's agent base, expanding internationally, embedding Matterport's 3D digital twin technology across its portals, and deploying AI across data collection and search.