Zoning Handbook

Main Floor: The floor of the story in which the principal entrance of a building is located.

Manufacturing, Light: A light production, distribution and repair use where all processing, fabricating, assembly, or disassembly of items takes places wholly
within an enclosed building.

Map Amendment: A change to the zoning designation of a lot or lots on the District of Columbia Zoning Map.

Marina: The use of land, buildings, structures, and the surface of water for the provision of docking and storage facilities for boats.

Mass Transit Facilities: Facilities, such as but not limited to stations, trackage, ventilating and electrical equipment, parking lots or structures and bus or automobile transfer areas, that have been determined by the Council of the District of Columbia to be necessary to the operation of a fixed right-of-way mass transit system and subject to the restrictions and conditions as may be imposed by the Council of the District of Columbia. Mass transit facilities shall not include commercial, residential, industrial, or other development located in, on, or over facilities approved as part of the basic operating system.

Material Salvage: The processing for further use of goods, wares, merchandise, substances, articles, or things.

Mayor: The Mayor of the District of Columbia.

Media Studio: A studio space dedicated to the recording or production of audio and/or visual art forms or the broadcast via radio, television, internet or other media of audio and/or visual art forms, or the combination of any of the above.

Median Family Income (MFI): The Median Family Income for a household in the Washington Metropolitan Statistical Area as set forth in the periodic calculation provided by the United States Department of Housing and Urban Development, adjusted for family size without regard to any adjustments made by the United States Department of Housing and Urban Development for the purposes of the programs it administers.

Metrorail Station: Rapid transit station operated by the Washington Metropolitan Area Transit Authority (WMATA).

Mezzanine: A floor space within a story between its floor and the floor or roof next above it and having an area of not more than one-third (1/3) of the area of the floor immediately below and which shares a common ceiling. Except in an RF zone, a mezzanine shall not be considered a story in determining the maximum number of permitted stories. In an RF zone, a mezzanine shall be considered a story in determining the maximum number of permitted stories within a principal structure, but shall not be considered a story in determining the maximum number
of permitted stories within an accessory building.

Monopole: A single, self-supporting pole-type structure, supporting a fixture designed to hold one (1) or more antennas. Such structures shall not be deemed ground-mounted antennas as that term is used in this chapter.

Mount: The necessary support structure to which an antenna is attached, not including antenna towers or monopoles.

Multifamily Project: As defined by the Secretary of the U.S. Department of Housing and Urban Development (HUD), means a project which consists of not less than five (5) dwelling units on one (1) site, each such unit providing complete living facilities including provisions for cooking, eating, and sanitation within the
unit and which is not now covered by a mortgage insured or held by the Secretary.

Nonconforming Structure: A structure lawfully existing at the time this title or any amendment to this title became effective that does not conform to all provisions of this title or such amendment, other than use, parking, loading, and penthouse requirements. Regulatory standards that create nonconformity of structures include, but are not limited to, height of building, lot area, width of lot, floor area ratio, lot occupancy, setback, court, and residential recreation space requirements.

Nonconforming Use: Any use of land or of a structure, or of a structure and land in combination, lawfully in existence at the time this title or any amendment to this title became effective that does not conform to the use provisions for the zone in which the use is located. A use lawfully in existence at the time of adoption or amendment of this title that would thereafter require special exception approval from the Board of Zoning Adjustment shall not be deemed a nonconforming use. That nonconforming use shall be considered a conforming use, subject to the further provisions of Subtitle X.

Optical Transmission Node: An interior or exterior facility that is utilized as remote terminal units for the operation of such things as cable television systems, high-speed internet access, and interactive video, not including any broadcast antenna or related towers for the transmission of radio waves.

Organization, Non-Profit: An organization organized, registered with the appropriate authority of government, and operated exclusively for religious, charitable, literary, scientific, community, or educational purposes, or for the prevention of cruelty to children or animals; provided that no part of its net income inures to the benefit of any private shareholder or individual.