HOUSTON-Five-year tenant, Sullins Johnston Rohrbach & Magers, stays put in Phoenix Tower, adding about 10% to the class A office after taking a look at other options in the Greenway Plaza and Galleria submarkets.

WASHINGTON, DC-The US Department of Transportation headquarters building at 400 7th St. will undergo a $150-million upgrade, says property owner David Nassif Associates. The 1.3-million-sf property will be vacated by the DOT when its new home in the Southeast Federal Center on M Street reaches completion in 2006.

WASHINGTON, DC-Chicago-headquartered law firm Sonnenschein Nath & Rosenthal LLP increases its presence at 1301 K St. by restructuring its lease and bringing its total occupancy to 108,000 sf from 80,000 sf. The firm is now the lead tenant at the building.

SACRAMENTO-Two days after announcing that its US Core Office Fund paid $287 million for two Downtown San Francisco office buildings totaling 766,000 sf, the Chicago-based company says its US Office Value Added Fund also has acquired Sacramento-area assets, paying $69.5 million for Capital Center II/III, a 10-building, 529,000-sf portfolio of low-rise office space located in Rancho Cordova.