A new segment of the real estate market. Definition of a mini apartment (living room). The world market of mini-apartments is analyzed. The issues of residence of various social groups in mini-apartments are investigated. The classification of mini-apartments has been developed. The factors affecting the cost of a mini-apartment are investigated. Conclusions are drawn about the mini-apartment market in the city. Mini-apartments are currently located in every country in Europe. Analysis of the value of real estate. Ukrainian market of mini-apartments. The mini-apartment in Ukraine is called "Gostinka". The dynamics of the development of the mini-apartment market is investigated. The mini-apartment market affects the real estate market in the region. The market of mini-apartments in different regions is analyzed. The authors built a GIS map. GIS analysis shows the dependence of the cost of mini-apartments on the region of Ukraine. The calculation of the profitability of mini-apartments was carried out using the method of market extraction (market selection). Calculated income from mini-apartments. Cost-benefit analysis reveals new aspects of the mini-apartment market for urban development in any region.