Inclusionary Unit: A dwelling unit set aside for sale or rental to a targeted household required by Subtitle C, Chapter 10.

Inclusionary Zoning Act (IZ Act): The Inclusionary Zoning Implementation Amendment Act of 2006, effective March 14, 2007(D.C. Law 16-275; D.C. Official Code §§ 6-1041.01 et seq.)). References to the IZ Act include any Mayor's Order, agency rule, or other administrative issuance promulgated pursuant to that legislation.

Inn: A building or part of a building in which habitable rooms or suites are reserved primarily for transient guests who rent the rooms or suites on a daily basis. Guestrooms or suites may include kitchens, but central dining, other than breakfast for guests, is not allowed. The term "inn" may be interpreted to include an establishment known as a bed and breakfast, hostel, or tourist home, but shall not be interpreted to include a hotel, motel, private club, rooming house, boarding house, tenement house, or apartment house. For the purposes of this definition, the limitation on central dining does not prohibit an inn from allowing guests to prepare their meals at centrally located cooking facilities and to eat such meals in a central dining area.

Intermediate Materials Recycling Facility: A structure used for the receipt, separation, storage, conversion, baling, and/or processing of paper, metal, glass, plastics, tires, bulk waste, and other non-biodegradable recyclable materials for the purpose of reutilization of the materials. Such facility shall not include storage or processing of biodegradable materials, construction and demolition debris, white goods, and hazardous substances, as defined by the District of Columbia Environmental Policy Act of 1989, effective October 18, 1989 (D.C. Law 8-36; D.C. Official Code § 8-109.02), and the rules and regulations pursuant thereto. The facility shall be limited in operation to baling, briquetting, crushing, compacting, grinding, shredding, and sorting of acceptable materials. The structure shall be fully enclosed by solid walls, exclusive of doors and windows, and a roof. Doors and windows shall be operative and kept closed except for the coming and going of vehicles and individuals.

International Organization: A public international organization designated as such pursuant to § 288 of the International Organizations Immunities Act, approved December 29, 1995 (59 Stat. 669; 22 U.S.C. §§ 288 - 288f-3), or a public international organization created pursuant to a treaty or other international agreement as an instrument through or by which two or more foreign governments engage in some aspect of their conduct of international affairs, and an official mission (other than a United States mission) to such a public international organization, including any real property of such an organization or mission and including the personnel of such an organization or mission.

Large Format Retail: A single retailer or common retail space with a minimum floor space of fifty thousand square feet (50,000 sq. ft.); the use shall include warehouse club stores with or without paid memberships, discount retailers, and similar uses. A large format retailer may include grocery sales as a secondary use but a grocery store shall not be considered a large format retail use.

Legitimate Theater: A building, or a part of a building, that is designed and used for the presentation of live plays and other forms of dramatic performance. The facility typically has a stage or other performing area plus tiers of seats for the
audience, or other arrangements for the audience to sit or stand to view the performance.

Loading berth: An off-street space provided for cargo vehicles, when loading and unloading.

Lot: The land bounded by definite lines that, when occupied or to be occupied by a building or structure and accessory buildings, includes the open spaces required under this title. A lot may or may not be the land so recorded on the records of the Surveyor of the District of Columbia.

Lot Lines: The lines bounding a lot as defined in this section.

Lot, Alley: A lot that faces or abuts an alley that does not face or abut a street at any point, and that is recorded on the records of the Office of the Surveyor or the Office of Tax and Revenue on or before November 1, 1957.

Lot, Corner: A lot fronting on two (2) or more streets at their junction, with the streets forming with each other an angle of forty-five degrees (45°) up to and including one hundred thirty-five degrees (135°).

Lot, Interior: A lot other than a corner lot or a triangular lot.

Lot Line, Street: A lot line that abuts a street.

Lot Occupancy: The percentage of the total area of a lot that is occupied by the total building area of all buildings and structures on the lot.

Lot of Record: A lot recorded on the records of the Surveyor of the District of Columbia.

Lot, Theoretical: A lot determined by dividing the subdivided lot into theoretical building sites.

Lot, Through: An interior lot having frontage on two (2) or more streets where the streets differ in direction by forty-five degrees (45°) or less.

Lot, Triangular: A lot fronting on two (2) streets at their junction, the streets forming with each other an angle of less than forty-five degrees (45°).

Lot Width: The distance between the side lot lines, measured along the building line; except that, in the case of an irregularly shaped lot, the width of the lot shall be the average distance between the side lot lines. Where the building line is on a skew, the width of the lot shall be the distance between side lot lines perpendicular to the axis of the lot taken where either side lot line intersects the building line.