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CoStar Group provides online real estate marketplaces, information, analytics and 3D digital twin technology for the property markets. It owns and operates marketplaces in the United States, Australia, Europe, Canada and Asia-Pacific. Underneath all of it is a database it has spent more than 35 years building and acquiring, covering homes, schools, communities, commercial properties, leasing, sales, comparable sales, tenants and demand statistics, with digital images, drone videos, 3D tours, plot maps and floor plans, and running to hundreds of data fields: zoning, building and unit characteristics, tax assessments, true ownership, lease comparables, vacancies and concessions, mortgage and deed information, income and expense histories, tenant names and credit scores, lease expirations and forecasts. It has over 8,000 employees in 20 countries. During the fourth quarter of 2025 it changed its segments from geography-based to product-based, leaving Commercial Real Estate and Residential Real Estate.

Where the data comes from

The research department collects and analyses commercial real estate information by telephone and email and through field inspections, public records review, news monitoring, third-party data feeds and user-entered content, with direct feeds from larger apartment sites, owners, brokers and home builders. The field work is physical: a typical site inspection involves photographing the building, capturing interior images, videos and Matterport 3D tours, measuring and geo-coding it, capturing for-sale or for-lease sign information, counting parking spaces, assessing condition and construction and gathering tenant information suite by suite. The same researchers also train clients on the products and handle their service questions. Because of the position the company holds in the industry, the filing says many professionals report available space and transactions to it unprompted, through an online tool it calls the Marketing Center.

Commercial Real Estate

CoStar itself is the subscription platform. Properties carries the inventory across office, industrial, retail, multifamily, hospitality, student housing and land, with for-lease and for-sale listings, historical data, analytics, photographs, demographics, maps and floor plans. Leasing holds lease transaction data and tools to manage a user's own lease data and run cash flow analysis from either the landlord's or the tenant's side. Sales is the transaction database used for comparables, appraisals and valuations. Tenants and Owners carry lease expirations, occupancy levels and growth rates. Markets reports trends in leasing, vacancy, rents, construction, investment sales and economic conditions, with forecasts. STR Benchmarking lets a hotel measure occupancy, average daily rate and revenue per available room against competitors. Debt Solutions gives lenders portfolio surveillance, concentration risk monitoring, stress testing and expected credit loss modelling. Alongside these, CoStar Real Estate Manager and Visual Lease are software products for lease administration, lease accounting and transaction management.

LoopNet is the marketing site, where owners, landlords and brokers advertise property for sale or lease with CoStar's own database content attached, sold as subscription ad packages: Silver for exposure to all site visitors, and Gold, Platinum and Diamond adding exposure across the network and retargeting across the web. The Domain acquisition added commercial listings in Australia. The rest of the segment is Matterport, whose 3D digital twins are sold by subscription alongside capture services and 3D capture cameras; BizBuySell, a marketplace for operating businesses and franchises for sale, where the seller pays to list and buyers search free; and Ten-X, a commercial real estate auction platform.

Residential Real Estate

These marketplaces gather consumer demand for homes to rent or buy, and the company sells marketing and leads to the agents, owners, landlords and property managers who want to reach those consumers. In the United States the brands are Apartments.com for rental communities, Homes.com, where owners and agents reach renters and buyers on what the company calls a your-listing your-lead basis and where Homes AI conducts two-way voice or text conversations to search and refine homes, and Land.com for rural property including farms, ranches, timberland, hunting land and country homes on acreage. Domain in Australia and OnTheMarket in the United Kingdom carry agent listings in those markets.

How it charges

Mostly subscription licence agreements that renew automatically, a majority of them running at least a year, priced as a fixed monthly fee rather than by usage or paid clicks. The rate depends on the number of sites and users, organisation size, the client's business focus and location, the number of properties reported on or analysed, the number of digital twins hosted, and how prominently a customer's advertised properties are placed in search results. Transaction-based work is the rest: premium listings for individual properties, data capture to create digital twins, sales of Matterport cameras and capture equipment, and Ten-X auction fees, which are generally a percentage of the final sale price and recognised when the sale closes.

From CoStar Group's annual report on Form 10-K for the year ended 31 December 2025. The filing

Written from the 10-K filed 26 February 2026: read the full 10-K.