To 1990 real estates owned by the State were dominated in polish cities. Conversions legally ñ structural and socially-economic after 1990 in Poland have caused singling out such owners as commune, administrative district and province. From 1990 there is flow from public sector to private sector. In the polish cities public sector is still strong (about 40% of area of the cities). In this paper authors have presented some principles of the public real estates management. Optimalization is base of works realize inside public real estate sector. There are range examples of this works for olsztyn municipality concerning public real estates.