24 C.F.R. § 100.201
As used in this subpart:
Accessible when used with respect to the public and common use areas of a building containing covered multifamily dwellings, means that the public or common use areas of the building can be approached, entered, and used by individuals with physical disabilities. The phrase "readily accessible to and usable by" is synonymous with accessible. A public or common use area that complies with the appropriate requirements of ICC A117.1-2009, ICC/ANSI A117.1-2003, ICC/ANSI A117.1-1998, CABO/ANSI A117.1-1992, ANSI A117.1-1986 (all incorporated by reference, see § 100.201a ) or a comparable standard is deemed "accessible" within the meaning of this paragraph.
Accessible route means a continuous unobstructed path connecting accessible elements and spaces in a building or within a site that can be negotiated by a person with a severe disability using a wheelchair and that is also safe for and usable by people with other disabilities. Interior accessible routes may include corridors, floors, ramps, elevators, and lifts. Exterior accessible routes may include parking access aisles, curb ramps, walks, ramps, and lifts. A route that complies with the appropriate requirements of ICC A117.1-2009, ICC/ANSI A117.1-2003, ICC/ANSI A117.1-1998, CABO/ANSI A117.1-1992, ANSI A117.1-1986 (all incorporated by reference, see § 100.201a ) or a comparable standard is an "accessible route" within the meaning of this paragraph.
Building means a structure, facility or portion thereof that contains or serves one or more dwelling units.
Building entrance on an accessible route means an accessible entrance to a building that is connected by an accessible route to public transportation stops, to accessible parking and passenger loading zones, or to public streets or sidewalks, if available. A building entrance that complies with ICC A117.1-2009, ICC/ANSI A117.1-2003, ICC/ANSI A117.1-1998, CABO/ANSI A117.1-1992, ANSI A117.1-1986 (all incorporated by reference, see § 100.201a ) or a comparable standard is a "building entrance on an accessible route" within the meaning of this paragraph.
Common use areas means rooms, spaces or elements inside or outside of a building that are made available for the use of residents of a building or the guests thereof. These areas include hallways, lounges, lobbies, laundry rooms, refuse rooms, mail rooms, recreational areas and passageways among and between buildings.
Controlled substance means any drug or other substance, or immediate precursor included in the definition in section 102 of the Controlled Substances Act (21 U.S.C. 802 ).
Covered multifamily dwellings means buildings consisting of 4 or more dwelling units if such buildings have one or more elevators; and ground floor dwelling units in other buildings consisting of 4 or more dwelling units.
Dwelling unit means a single unit of residence for a family or one or more persons. Examples of dwelling units include: a single family home; an apartment unit within an apartment building; and in other types of dwellings in which sleeping accommodations are provided but toileting or cooking facilities are shared by occupants of more than one room or portion of the dwelling, rooms in which people sleep. Examples of the latter include dormitory rooms and sleeping accommodations in shelters intended for occupancy as a residence for homeless persons.
Entrance means any access point to a building or portion of a building used by residents for the purpose of entering.
Exterior means all areas of the premises outside of an individual dwelling unit.
First occupancy means a building that has never before been used for any purpose.
Ground floor means a floor of a building with a building entrance on an accessible route. A building may have more than one ground floor.
Handicap means, with respect to a person, a physical or mental impairment which substantially limits one or more major life activities; a record of such an impairment; or being regarded as having such an impairment. This term does not include current, illegal use of or addiction to a controlled substance. For purposes of this part, an individual shall not be considered to have a handicap solely because that individual is a transvestite. As used in this definition:
Interior means the spaces, parts, components or elements of an individual dwelling unit.
Modification means any change to the public or common use areas of a building or any change to a dwelling unit.
Premises means the interior or exterior spaces, parts, components or elements of a building, including individual dwelling units and the public and common use areas of a building.
Public use areas means interior or exterior rooms or spaces of a building that are made available to the general public. Public use may be provided at a building that is privately or publicly owned.
Site means a parcel of land bounded by a property line or a designated portion of a public right or way.
24 C.F.R. §100.201