They are where people live for the long term (they count as residential only if there are four or fewer units), so they also include condominiums and mobile home parks.
Multifamily rental properties are apartment buildings, town houses, and multi-unit properties like high-rises in urban areas. They are where people live for the long term (they count as residential only if there are four or fewer units), so they also include condominiums and mobile home parks. Multifamily homes, including duplexes, triplexes, and quadplexes, may be included in this type of property, though many lenders allow typical residential mortgages to purchase smaller multifamily homes.