The housing market is very important even in the period of crisis because people always have welfare and investment needs. Therefore the spatial analysis of secondary market (prices, attributes of apartments) is of interest. The aim of the paper is spatial analysis of transactions on the secondary housing market in housing estates and quarters in Szczecin. The peripheral quarters will be assigned and concentration indices will be calculated. The data come from notarial deeds referring to the transaction on the secondary housing market in Szczecin. Each transaction is described by a set of variables – the date of sale, transaction price, apartment area, the number of rooms or the level the apartment is located on.