RX zone is a high-density multi-dwelling zone that allows the greatest intensity of development scale in the residential zones. The zone is applied within Portland?s most intensely urban areas, specifically the Central City and the Gateway Regional Center. Allowed housing development is characterized by large buildings with a very high percentage of building coverage. The major types of new housing development will be mid-rise and high-rise multi-dwelling structures, often with allowed retail, institutional, or other service-oriented uses. Development is intended to be pedestrian oriented, with buildings that contribute to an urban environment with a strong street edge of buildings located close to sidewalks. The Design overlay zone is applied to this zone. Tenants in property Do not Disturb.