PNC Plaza in downtown Louisville has been sold.A division of Optima International purchased the building at 5th and Jefferson streets for roughly $77 million.Business First reports that the tower's value has increased since it was sold in 2000 and 2007, and that could be indicative of increased value of downtown properties in the wake of Museum Plaza's cancellation.Optima International's investment wing, Optima Ventures LLC has been purchasing buildings for years,recently buying several buildings in Ohio and at least one in Illinois. The parent company has invested in various industries in Eastern Europe.