They consist of buildings with shops or dwellings on the lowest two storeys. In Sofia there are 607,473 dwellings and 101,696 buildings. Later inhabitants built above-ground dwellings called pueblos. Seven of the planned single family dwellings will be replaced with townhouses. The outer town housed estates, churches, monasteries, workshops and dwellings. Most islets were once occupied by the dwellings of priests. They apparently lived in caves and open dwellings. Building the three hundred dwellings took seven years. Remnants of Copper Age settlements, including pit dwellings, date back 4,000 years. Approximately 4% of all dwellings were vacant. This decision automatically sets the amounts levied on all types of households and dwellings. In urban areas collection districts average about 220 dwellings. Amr had the original tents of Fustat replaced with mud brick and baked brick dwellings. To prosper, medieval Europeans needed rights to own land, dwellings, and goods. Its rooms are not clustered like typical cliff dwellings.