The article analyzes architectural features of the Muslim settlement Zaistochye located in the city of Tomsk. The settlement was created by the so called, «Siberian Bukharans» and Islamized Siberian Tartars during the founding of the city. Originally, the settlement was based on religious affiliation. The article relies on the documents from the State Archive of the Tomsk Oblast. Along with traditional documents and statistical data, the article uses a lot of visual sources (from Tomsk maps to architectural drawings and photographs taken in Tomsk in April 2014 by the author during the field research). Private houses in the Tatar settlement reflect the religious, ethnic and social affiliation of their owners. For instance, a mansion built by the Tomsk merchant M.-K. Khamitov, demonstrates Islamic principles of space planning, combined with the eastern Moorish aesthetic style with its stucco floral ornament. Middle class urban dwellers of the settlement lived in one - or two-story, residential apartment buildings built of wood or mixed type. Cornices, friezes, and architraves of these building were decorated with traditional Tatar floral woodcarvings. Being a striking piece of the architectural urban heritage of Siberia, the Tatar settlement is a vivid representation of ethnic and religious diversity practiced in the Siberian city in the XIX - early XX century.