There are cottages, villas, bungalows and mansions. Cottages are smaller cozy buildings, and sometimes refer to older buildings. Mansions have specialty rooms (theatre, library, etc.), servant quarters, multiple bedrooms, and in general are luxury units. Bungalows are single story buildings. A residential area is a land used in which housing predominates, as opposed to industrial and commercial areas. Housing may vary significantly between, and through, residential areas. These include single-family housing, multi-family residential, or mobile homes