OMAHA, NE-The company has purchased the former headquarters of Northern Natural Gas Co., a 15-story, 255,000-square-foot office built in 1955, for $2.3 million.

NEW BERLIN, WI-Affiliates of Angelo, Gordon & Co. wanted the 500,000-square-foot flex building, with 60,000 square feet of office, because the tenant has a new 15-year lease.

JEDDAH, SAUDI ARABIA-Work will begin on Kingdom Tower, which designers promise will become the world’s tallest building at 3,281 feet tall, in the $20 billion Kingdom City project.

CHICAGO-Lucien Lagrange has rehired with a firm 26 years after forming the noted Lucien Lagrange Architects, following a bankruptcy filing forced by divorce.

CHICAGO-The energy company, the parent firm of People’s Gas, is relocating its 196,000-square-foot headquarters at One Prudential Plaza to Aon Center, at 200 E. Randolph St. downtown.

PARIS-Owner Tishman Speyer is calling the transaction at the 1.4-million-square-foot building the city’s largest-ever office deal.

ST. PAUL-The locally based Oak Grove Capital helped arrange the Fannie Mae credit facility for 44 properties owned by Brookdale Senior Living, based in Brentwood, TN.

BEIJING-Taubman Centers has acquired a 90% stake in Beijing-based TCBL Consulting, and Jones Lang LaSalle has taken over Procon in Jakarta, Indonesia.