Press Release

Ballard Spahr Provides Counsel to CoStar Group for Acquisition of Office Tower in Arlington, VA

February 15, 2024

Ballard Spahr served as lead counsel to CoStar Group for the company’s recent acquisition of a Class A office tower in the Rosslyn section of Arlington, Virginia.

CoStar Group—a leading commercial real estate information, analytics, and news platform—this week announced its purchase of the 31-story building at 1201 Wilson Blvd. The company plans to move more than 500 employees to the 552,000-square-foot Rosslyn site from its current headquarters in Washington, D.C., by the end of 2025.

Katherine M. Noonan, practice leader of Ballard Spahr’s Real Estate Development and Transactions Group, and Desmond D. Connall, Jr., practice leader of the firm’s Leasing Team, represented CoStar Group in the transaction.

Certified as a LEED Platinum green building, 1201 Wilson Blvd. is located directly above the Rosslyn Metro rail station, with excellent access to Ronald Reagan Washington National Airport and other transportation. The Rosslyn location will provide employees with easy access to extensive retail and dining amenities, a network of biking and jogging trails, and the Potomac River waterfront, CoStar Group said. Rosslyn is a highly desirable location known for its urban sophistication, strategic location near Washington, and vibrant residential and commercial communities.

For more information, see the CoStar Group announcement.

About CoStar Group, Inc.

CoStar Group (NASDAQ: CSGP) is a leading provider of online real estate marketplaces, information, and analytics in the property markets. Founded in 1987, CoStar Group conducts expansive, ongoing research to produce and maintain the largest and most comprehensive database of real estate information. CoStar is the global leader in commercial real estate information, analytics, and news, enabling clients to analyze, interpret and gain unmatched insight on property values, market conditions and availabilities. is the leading online marketplace for renters seeking great apartment homes, providing property managers and owners a proven platform for marketing their properties. LoopNet is the most heavily trafficked online commercial real estate marketplace with over 12 million monthly global unique visitors. STR provides premium data benchmarking, analytics, and marketplace insights for the global hospitality industry. Ten-X offers a leading platform for conducting commercial real estate online auctions and negotiated bids. is the fastest growing online residential marketplace that connects agents, buyers, and sellers. OnTheMarket is a leading residential property portal in the United Kingdom. BureauxLocaux is one of the largest specialized property portals for buying and leasing commercial real estate in France. Business Immo is France’s leading commercial real estate news service. Thomas Daily is Germany’s largest online data pool in the real estate industry. Belbex is the premier source of commercial space available to let and for sale in Spain. CoStar Group’s websites attracted over 160 million unique monthly visitors in September 2023. Headquartered in Washington, DC, CoStar Group maintains offices throughout the U.S., Europe, Canada, and Asia. From time to time, it utilizes its corporate website,, as a channel of distribution for material company information. For more information, visit

For media inquiries, please contact Bill Shralow at 215.864.8195.

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