Acquisition adds the homebuilding industry's leading B2B information platform - used by builders, developers, and lenders - and brings NewHomeSource.com, the category-defining new home marketplace, into CoStar Group's family of marketplaces. ARLINGTON, Va.--( BUSINESS WIRE )-- CoStar Group, Inc. (NASDAQ: CSGP), a leading provider of online real estate marketplaces, information, and analytics across the property markets, today announced that it has entered into a definitive agreement to acquire Zonda, a leading provider of new home construction data, homebuilder software, and residential real estate marketplaces, for $800 million in cash. Zonda serves more than 3,000 customers across the homebuilding ecosystem, including many of the largest residential builders, developers, suppliers, and lenders in North America.…