CHICAGO — A joint venture between CIM Group and Golub & Co. has acquired 444 N. Michigan, a 36-story office tower along Chicago’s Magnificent Mile. Germany-based GLL Real Estate Investors sold the asset for $138 million, according to Crain’s Chicago Business. Built in 1976, the 517,000-square-foot also includes ground-floor retail space. Technology, media, healthcare, law, real estate and professional services tenants occupy the office portion. CIM Group and Golub & Co. are in the midst of redeveloping the landmark Tribune Tower into luxury condos.