"Gothic" and "Renaissance" living rooms, a "Rococo" Golden Chamber, a Dutch "Burger" dining room — unique spaces as well as invaluable artistic and intellectual documents of the late 19th century. Apart from Robert Meltzer, the following architects and artists contributed to the design of the Khanenkos' mansion: Leonardo Marconi, Pyotr Boitsov, Wilhelm Kotarbinski, Mikhail Vrubel, and Adrian Prakhov. In contrast to the artistic spirit of the ground and the first floor, the Khanenkos' private rooms on the third floor of the house, the so-called mezzanine, were decorated very modestly, even ascetically. Judging from archival photos of the house, artworks in the Khanenkos' private art gallery were often rearranged depending on the changes in the couple's interests or their new acquisitions. In 1919, Varvara Khanenko and the art historian Georgy Lukomsky curated the first public museum exhibition which opened on the ground and the first floors of the mansion. Varvara Khanenko lived in the rooms of the second mezzanine floor for the rest of her life (until May 1922). In 1930–1934, the first museum exhibition of Islamic arts, curated by Maria Vyazmitina, opened on the second floor of the house. According to unconfirmed data, during WWII, the Nazi Officers Club was housed in the museum. Then the mansion was damaged, which made the museum's management dismantle part of the Khanenkos' historic architectural settings. As a result, the interior of the Delft Dining Room was almost completely lost. After substantial restoration and conservation works on the Khanenkos' mansion conducted in 1986–1998, most of the houses' unique old interiors were saved and restored. The coat of arms of the Khanenko family re-took its original place on the front façade between the windows of the first floor. The Sakhnovskis' house The Sakhnovskis' historic house located at 17 Tereshchenkivska Street was commissioned by Adelaida Sulymovska and built in 1878. The project was designed by the architect Volodymyr Nikolayev. The house is a three-storey building if faced from the street, and has five floors if faced from the yard. Unlike the neighbouring Khanenkos' mansion, which was constructed a decade later, it was conceived as a rental apartment house. The facade is designed in the eclectic style with Neo-Renaissance elements, namely the round medallions with sculptural human heads decorating the windows of the first floor, as well as Corinthian columns and pilasters adorning the windows of the first and the second floors. In 1880, it was in