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ORDINANCE NO. 2194 EXHIBIT A Page 20 of 28 18.84.010 of this chapter, provided that in the RM district each dwelling unit shall have private usable open space of at least the minimum area specified by subsection C of this section. Group and private usable open space may be combined to meet the requirements. Each square foot of private usable open space shall be considered equivalent to two square feet of group usable open space and may be so substituted. All required usable open space shall be planted area, or shall have a dust-free surface, or shall be water surface, provided that not less than 10 percent of the required group usable open space at ground level shall be landscaped with trees and other plant materials suitable for ornamentation. No required usable open space shall be located in a parking area, driveway, service area, or required front yard, or shall have a slope greater than 10 percent. 18.84.220 Screening of open uses. A use not conducted within a completely enclosed structure shall have screening of a height specified by the zoning administrator if located in an I-P district or in a C or district adjoining or opposite across a street or alley from an R district or if located in C- S or I district adjoining or opposite across a street from an 0, C-N, C-C, MU, C-R or P district, unless the zoning administrator finds that topographic or other physical conditions or the characteristics of the use make screening unnecessary or ineffective for protection of the adjoining or opposite district. 18.84.230 Landscaping of parking facilities. In an 0, C-N, C-C, MU I-P, or P district, not less than five percent of the area with a line drawn around the outer edges of the area occupied by vehicles shall be landscaped with trees and other plant materials suitable for ornamentation. Landscaped areas shall be distributed throughout the parking area. In addition, a landscaped area not less than five feet in depth shall be located at the property lines adjoining the street frontages of the site except for necessary drives and walks.