In 1922/1923 Otto Kohtz built a single-family house in Berlin-Dahlem for himself and his wife Agnes Kuban. The house had a centrally organized lobby/ballroom with smaller rooms arranged around it. Beginning in1934, Kohtz enlarged the building with a portico on the front of the house, towards Schweinfurthstraße and a sunroom on the east side. The ellipsoidal central hall was clad on all sides with wood paneling and was illuminated by a clearstory that towered above the ground floor. After the death of Otto Kohtz, the building was sold and in 1958 was acquired by the TU Berlin. After several years of disuse the building was bought by an association of owners in 2012, and over the next three years was extensively restored and enlarged by adding a two-story addition. A large, frame-like window across the entire width of the new addition allows viewers on the outside of the building to look completely through the new structure to the facade of the original. Old photos show that the portico's columns were originally crowned by busts, which were removed and covered with mortar after the building was sold in 1958. Research has shown that uncovered sculptural images are portrayals of Otto Kohtz, his wife Agnes Kuban and family members. The creators of the murals rediscovered behind the wood paneling remain unknown, however, although they have now been restored to their original grandeur