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(1)Major exterior surfaces on walls shall be face brick or stone. Glass, stucco, 98 architecturally treated concrete, cast-in-place or precast panels or decorative 99 block will be acceptable as the major exterior wall surface when they are 100 incorporated into an all overall design which is compatible with the standards for 101 the district in which it is located. Wood and metal may be used as accent 102 materials; provided that they are appropriately integrated into the overall building 103 design and not suited in areas that will be subject to damage associated with heavy 104 use; 105 (2)Under no circumstances shall sheet metal aluminum, corrugated aluminum, 106 asbestos, iron plain or painted, or plain concrete block be acceptable as major 107 exterior wall material on buildings within the city except for industrial and large 108 retail commercial buildings (greater than 100,000 square feet), rear and side 109 exterior surfaces that are not visible from any public street or adjoining property 110 may be constructed of a lesser material than the front of the building; 111 (3)Garages, accessory structures, screen walls and exposed areas of retaining walls 112 shall be of a similar type, quality, and appearance as the principal structure unless 113 such a structure is not visible or is fully screened from any public street or 114 adjacent property; and 115 (4)A nonconforming building or structure shall not be altered or enlarged in any 116 manner unless such alterations or enlargements are made to bring the building or 117 structure into conformity with the regulations of this chapter. 118 SC TAFF OMMENT 119 While some municipalities control the mix with specific percentages, others have chosen to 120 establish a general requirement in an attempt to offer flexible design. These strategies are not 121 bad, but they are also not perfect. Roseville found out last year that the limitation on the use of 122 metal siding may be overly restrictive and that its expanded use could be done in an aesthetically 123 pleasing design. Architects appear to be using more architectural metals and other products in an 124 effort to provide greater variety in building design. Specifically, the Variance Board approved 125 metal siding for Pizza Lucé (41% on the west elevation and 46% on the east elevation) and for 126 North American Banking (60% on the north elevation). 127 Similarly, municipalities regulate materials they desire and those they find undesirable. The pole 128 barn and its corrugated galvanized exterior comes to mind as a material use most communities 129 want to prohibit in residential, commercial and most industrial districts. Other materials such as 130 plain concrete masonry units, iron (plain or painted), or aluminum sheets, are not all that 131 desirable as a primary material and should be regulated. 132 Regarding the Residential Districts, the Planning Division is proposing to establish a mix of 133 materials that is consistent with current residential construction. The proposal, as written, 134 requires a combination of materials; however it does not limit any of the material choices. 135 Regarding the Commercial and Mixed-Use, Employment, and Institutional Districts, the 136 Planning Division did discuss potential ramifications of increasing the use of metal siding and 137 other materials not specified, as well as better way to offer a broader range of material choices 138 without being too prescriptive. In the end, the Division determined that grouping materials and 139 PROJ0017_Amdt28_RPCA_020316020316 Page 4 of 6