ROCKVILLE, MD-In a 1031 exchange, the Williamson Group acquires the Research Boulevard Center, a dual-structure complex consisting of 257,500 sf of office space. The seller was TA Associates

BETHESDA, MD-Development Alternatives Inc. commits to 95,000 sf of space that formerly housed offices of National Energy & Gas Transmission. The occupancy level in the 200,000-sf building is now near 100%.

ARLINGTON, VA-National Cooperative Bank commits to 87,000 sf at 2011 Crystal Dr., the former home of the US Patent & Trademark Office. NCB will relocate most of the employees from its Washington, DC-based headquarters to the 440,000-sf building in Arlington's Crystal City submarket.

CHEVY CHASE, MD-In a transaction valued at $211 million, commercial finance firm CapitalSource Inc. wraps up the acquisition of 37 skilled nursing facilities and one assisted living facility through its new down-REIT CSE SNF Holdings LLC.

CHEVY CHASE, MD-In a transaction valued at $211 million, commercial finance firm CapitalSource Inc. wraps up the acquisition of 37 skilled nursing facilities and one assisted living facility through its new down-REIT CSE SNF Holdings LLC.

HERNDON, VA-Ground breaks on 2300 Dulles Station Blvd., a 185,000-sf office building that will be part of a 540,000-sf, two-structure complex at the mixed-use Dulles Station development. The six-story spec building carries a reported $50-million price tag.

WASHINGTON, DC-Progress is made on the $667-million development of a new baseball arena for the Washington Nationals with the creation of a new stadium lease between the District and Major League Baseball. The new agreement calls for funding from four outside sources, including MLB's $92 million in rent payments to the District.

WASHINGTON, DC-Progress is made on the $667-million development of a new baseball arena for the Washington Nationals with the creation of a new stadium lease between the District and Major League Baseball. The new agreement calls for funding from four outside sources, including MLB's $92 million in rent payments to the District.