Uptown Center: A multi-purpose major activity center with strong transit orientations and significant concentration of employment and high density
residential as the principal elements, developed in a manner that serves the surrounding lower density community while protecting it from avoidable intrusions.

Urban Tree Canopy: The layer of leaves, branches, and stems of trees that cover the ground when viewed from above.

Use: The purpose or activity for which a lot or building is occupied. Use shall be considered as though followed by the words "or intended, arranged, or designed to be used or occupied, offered for occupancy."

Use, Accessory: A use customarily incidental and subordinate to the principal use, and located on the same lot with the principal use. Unless otherwise
specifically permitted, an accessory use in a residential dwelling in a residential zone shall be limited to twenty percent (20%) of the gross floor area.

Use, Principal: The primary purpose or activity for which a lot or building is occupied.

Use, Temporary: Any use which is established for a fixed period of time with the intent that permission for that use will expire automatically unless renewed. The time period of the allowance of the use shall be determined by the certificate of

Vegetated Roofs: A horizontal or near-horizontal surface on top of a building or structure covered with vegetation and a growing medium. Vegetated roofs are intended to promote water or energy conservation by using plants and soils to slow, filter, and infiltrate stormwater runoff. Vegetative roofs may be intensive or extensive but are not limited to modular or layered growth systems.

Vegetated Walls: A vertical or near vertical surface covered with vegetation and in some cases, a growing medium. Vegetated walls may include but are not
limited to walls or screens with climbing vines, espalier trees, or modular planting systems.

Veterinary Boarding Hospital: A veterinary hospital that boards animals as an independent line of business.

Veterinary Hospital: An establishment used by a licensed veterinarian for the practice of veterinary medicine and not as an animal boarding establishment.

Wall, Lot Line: An enclosing wall constructed immediately adjacent to a side lot line, but not a party wall.

Wall Plate: A horizontal member built into or laid along the top of a wall to support and distribute pressure from joists, rafters, etc.

Warehouse: Any building or premises where goods or chattel are stored. The term "warehouse" shall not include storage clearly incidental to the conduct of a retail business or other permitted use on the premises or a Self-Storage Establishment.

Waterfront: That area proximate to either the Washington Channel or Potomac or Anacostia Rivers. See Subtitle C, Chapter 11.