State Teachers Retirement System of Ohio, Columbus, has entered into a...

State Teachers Retirement System of Ohio, Columbus, has entered into a joint venture with Prime Group Realty Trust, which purchased a 50% interest in 77 W. Wacker Drive, Chicago, said Steve Mitchell, chief investment officer at the $53 billion system. The pension fund has invested $66 million in preferred stock and $22 million in common stock in the joint venture, while Prime Group Realty invested $22 million in common stock. The 944,000-square-foot office tower is valued at $280 million.