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f. Landscaping performance securiry•ired.When screening,landscaping or other similar rovements to property are required by this division,a letter of credit shall be supplied by the owner in an amount equal to at least 1%times the value of such screening,landscaping or other improvements.The letter of credit shall be conditioned upon reimbursement of all expenses incurred by the city for engineering,legal, contracting or other fees in connection with making or completing such improvements.The letter of credit shall be provided prior to the issuance of any building permit and shall be valid for a period of time equal to two full growing seasons after the date of installation of the landscaping.The city may accept some other form of security in lieu of a letter of credit in an amount and under such conditions that the city may determine to be appropriate.If construction of the project is not completed within the time prescribed by building permits and other approvals,the city may,at its option,complete the work required at the expense of the owner and the surety.The city may allow an extended period of time for completion of all landscaping,if the delay is due to conditions which are reasonably beyond the control of the developer.Extensions,which may not exceed nine months,may be granted due to seasonal or weather conditions.When an extension is granted,the city shall require such additional security as it deems appropriate. g. Screening and buffering. 1. The following uses shall be screened or buffered in accordance with the requirements of this section: Principal buildings and structures and any building or structure accessory thereto used for residential uses at a density of greater than four units per acre shall be buffered from residential lots located in any R district. ii. Off-street parking facilities containing six or more spaces shall be buffered from streets located within 50 feet.Parking facilities shall be buffered with landscape zones. iii. Loading docks shall be screened from all lot lines and public roads. iv. Trash storage facilities shall be screened from all lot lines and public roads. v. Access roads serving multifamily buildings shall be screened as necessary to eliminate the impact of vehicle headlights shining toward adjacent residential neighborhoods. 2. Required screening or buffering may be achieved with fences,walls,earth berms,hedges,or other landscape materials.All walls and fences shall be architecturally harmonious with the principal building.Earth berms shall not exceed a slope of 3:1.The screen shall be designed to employ materials which provide an effective visual barrier during all seasons. 3. All required screening or buffering shall be located on the lot occupied by the use,building,facility or structure to be screened.No screening or buffering shall be located on any public right-of-way or within eight feet of the traveled portion of any street or highway. 4. Screening or buffering required by subsection(14)of this section shall be of a height needed to accomplish the goals of subsection(14) of this section.Screening methods incorporating roofs over storage,trash or mechanical facilities to screen from higher adjacent properties or buildings may be required.Height of plantings required under subsection(14)of this section shall be measured at the time of installation. (15) Architectural standards. a. It is not the intent of the city to restrict design freedom unduly when reviewing project architecture in connection with a site and building plan.However,it is in the best interest of the city to promote high standards of architectural design and compatibility with surrounding structures and neighborhoods.Architectural plans shall be prepared by an architect or other qualified persons acceptable to the city and shall show the following for all structures other than single-family detached dwellings: 1. Elevations of all sides of the building. 2. Type and color of exterior building materials. 3. A typical floor plan. 4. Dimensions of all structures. 5. The location of trash and recycling containers and of heating,ventilation and air conditioning equipment. b. Unadorned prestressed concrete panels,concrete block and unfinished metal shall not be permitted as exterior materials for residential principal and accessory buildings.This restriction shall apply to all principal structures and to all accessory buildings.The city may,at its discretion, allow architecturally enhanced block or concrete panels. Page 7