A. Except as may be approved by the city council and except for lots of record, preliminary platted lots, and residential planned unit development concepts having legal standing on January 1, 1998, lots in all zoning districts of the city must contain usable/buildable upland equal to at least eighty percent (80%) of the required minimum lot areas. The required upland area shall not contain wetlands, streams, ponds, or any other nonbuildable terrain. Lots which involve wetland mitigation practices shall be evaluated for conformance with this requirement based on wetland mitigation plans indicating areas of wetland filling or dredging.
B. In addition to the setbacks required for principal and/or accessory structures under individual zoning districts of the city or in other sections of this ordinance, all structures must be set back a minimum of twenty feet (20') from the ordinary high water level or elevation of the line of permanent aquatic vegetation (whichever is greater) of wetlands, ponds or drainageways.
C. Except for elderly (senior citizen) housing, each multiple- family dwelling site shall contain at least five hundred (500) square feet of "usable open space", as defined in section 200.2 of this ordinance, for each dwelling unit contained thereof. (Ord. 1988-12, 12-19-1988; amd. Ord. 1997-17, 11-17-1997)