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to conditions which are reasonably beyond the control of the developer. Extensions,which may not exceed <br /> nine months,may be granted due to seasonal or weather conditions.When an extension is granted,the city <br /> shall require such additional security as it deems appropriate. <br /> g. Screening and buffering. <br /> 1. The following uses shall be screened or buffered in accordance with the requirements of this section: <br /> i. Principal buildings and structures and any building or structure accessory thereto used for residential <br /> uses at a density of greater than four units per acre shall be buffered from residential lots located in <br /> any R district. <br /> ii. Off-street parking facilities containing six or more spaces shall be buffered from streets located within <br /> 50 feet. Parking facilities shall be buffered with landscape zones. <br /> iii. Loading docks shall be screened from all lot lines and public roads. <br /> iv. Trash storage facilities shall be screened from all lot lines and public roads. <br /> v. Access roads serving multifamily buildings shall be screened as necessary to eliminate the impact of <br /> vehicle headlights shining toward adjacent residential neighborhoods. <br /> 2. Required screening or buffering may be achieved with fences,walls,earth berms, hedges, or other <br /> landscape materials.All walls and fences shall be architecturally harmonious with the principal building. <br /> Earth berms shall not exceed a slope of 3:1.The screen shall be designed to employ materials which <br /> provide an effective visual barrier during all seasons. <br /> 3. All required screening or buffering shall be located on the lot occupied by the use, building,facility or <br /> structure to be screened. No screening or buffering shall be located on any public right-of-way or within <br /> eight feet of the traveled portion of any street or highway. <br /> 4. Screening or buffering required by subsection(14)of this section shall be of a height needed to <br /> accomplish the goals of subsection(14)of this section.Screening methods incorporating roofs over <br /> storage,trash or mechanical facilities to screen from higher adjacent properties or buildings may be <br /> required. Height of plantings required under subsection(14)of this section shall be measured at the time <br /> of installation. <br /> (15) Architectural standards. <br /> a. It is not the intent of the city to restrict design freedom unduly when reviewing project architecture in <br /> connection with a site and building plan. However,it is in the best interest of the city to promote high <br /> standards of architectural design and compatibility with surrounding structures and neighborhoods. <br /> Architectural plans shall be prepared by an architect or other qualified persons acceptable to the city and <br /> shall show the following for all structures other than single-family detached dwellings: <br /> 1. Elevations of all sides of the building. <br /> 2. Type and color of exterior building materials. <br /> 3. A typical floor plan. <br /> 4. Dimensions of all structures. <br /> 5. The location of trash and recycling containers and of heating,ventilation and air conditioning equipment. <br /> b. Unadorned prestressed concrete panels,concrete block and unfinished metal shall not be permitted as <br /> exterior materials for residential principal and accessory buildings.This restriction shall apply to all principal <br /> structures and to all accessory buildings.The city may,at its discretion,allow architecturally enhanced block <br /> or concrete panels. <br /> c. Accessory buildings shall be architecturally compatible with principal structures. <br />