sentences:  It was renovated in 1975 under the direction of Cleveland architect Peter van Dijk, and again by Hines Properties in 1991.The building features a rooftop ticket lobby and waiting room designed for dirigible flights to New York and Chicago; the roof was never utilized because of the high winds from Lake Erie.In June 2010 it was purchased for $18.5 million by Optima International, a Miami-based real estate investment firm led by Chaim Schochet and 2/3rd owned by the Privat Group, one of Ukraine's largest business and banking groups.