When an upper floor was included, the inhabitants used it as living quarters, while the ground floor was used as a stable for livestock and for storage.[1] There were multiple variations on the basic four-room house. Some had a five-, three-, or two-room layout, and sometimes the rooms were divided by additional walls into smaller areas. Acknowledging these sub-types of the four-room house, the popularity of the structure started at the beginning of Iron Age I (end of the eleventh century BCE) and dominated the architecture of Israel through Iron Age II until the Babylonian Exile.