During Soviet times, apartments were lent to people by the government according to the square meters-per-person norm (some groups, including people's artists, heroes, and prominent scientists had bonuses according to their honors). Private ownership of apartments was limited until the 1990s when people were permitted to secure property rights to their inhabited places. Since the Soviet era, estate owners have had to pay the service charge for their residences, a fixed amount based on persons per living area.