Kleanthi-Schaubert, or the “Old University,” is on Tholou street in one of the higher sections of Plaka. Built around the 17th Century, the institution was purchased from its Ottoman owner by two close friends, architects Kleanthis and Schaubert, who, after arriving in the newly liberated Athens, went to work on the old building, repairing and restoring its huge walls and domed basements, adding other buildings, and uniting them all into a single complex. In 1834 the building housed the Girls High School and, later, the newly founded University.
Then, in 1837, three new rooms and an Anatomy auditorium were added to cover the needs of the new University. When the University finally moved into its own building after 1841, the original Kleanthi Residence became the Didaskaleion and the Experimental InterTeaching School, which was later used as a barracks. The facility changed hands many times over the years, and was used for various purposes until 1963 when it was declared a listed building. In 1967 it was officially assigned to the University. Since then it has been restored, and now houses the University’s History Museum.
Source: www.athensattica.gr