Multi Family
Multi-family residential (also known as Multi-dwelling unit or MDU) is a classification of housing where multiple separate housing units for residential (i.e. non-commercial) inhabitants are contained within one building or several buildings within one complex. A common form is an apartment building. Sometimes units in a multi-family residential building are condominiums, where typically the units are owned individually rather than leased from a single apartment building owner. Many intentional communities incorporate multi-family residences, such as in cohousing projects.
Two-flat - a building basically like a house, commonly built on a house lot, consisting of a flat (apartment) taking up the first floor, another flat taking up the second floor, usually a common basement, a common front entrance, foyer, and stairs to the second floor, and often a similar back entrance, foyer, and stairs. In old buildings, the back entrance, foyer, and stairs may have been added on later. Sometimes there are front verandas for
each of flats, one above the other. Typically the whole building is owned by the same party. A property of this type, must have external entrance for each unit, otherwise it can be considered a single unit since for Two-flat, the asset need to comply with the separated units guides created by HUD and regulated by the mortgage industry.