16.040 Requirements for Planned Residential Development Projects

(Amended 4/11/00; 08/13/02; 12/08/15; 09/08/20; 02/08/22; 02/22/22; 08/23/22) A. Qualifying Districts. Planned Residential Developments may be allowed at the discretion of the Planning Commission and City Council in all agricultural and residential districts within the City with a minimum area requirement of ten acres. B. Procedure for Approval. Planned Residential Developments are allowed subject to the requirements of this Chapter and the site plan and subdivision requirements, review, and procedures as contained in this Code. C. Density. The overall project may not exceed the density allowed by the underlying zoning district plus any additional density bonus allowed at the discretion of the Planning Commission and City Council. D. Calculation of Density. The number of dwelling units allowed in a Planned Residential Development is to be calculated in the following manner: 1. The following areas shall be subtracted from the gross site area to determine net usable area: (a) areas of steep slopes, wetlands, or areas below the high water level of Utah Lake as defined in Section 12.060-K of this Code; (b) the area of any perennial channels, measured from top of bank to top of bank of the flow channel; (c) existing public streets, any areas of additional right-of-way required to comply with the Lehi City Master Transportation Plan; and (d) areas to be set aside for public buildings or institutional uses including churches and schools. 2. Net usable site area shall be multiplied by the density allowed by the underlying zoning district as established in Table 05-040-A to identify the maximum number of allowed units. 3. Density for areas in the 100-year flood plain as shown on the FEMA Flood Insurance Rate Maps shall be as determined by the Planning Commission and City Council on a case-by-case basis at the time of Concept Plan approval. 4. If the Planned Residential Development is located in more than one zoning district, the total allowed number of units shall be calculated by adding the number of units allowed by each zoning district. However, the dwelling units may be placed without regard to district boundaries, provided the total units do not exceed that allowed by the underlying zoning districts. E. Density Bonus Amenities: The list below represents items for which a density bonus may be granted subject to Planning Commission and City Council approval. Other items not included in this list may be considered for a density bonus on a case by case basis. 1. Active Recreation: master planned trails, swimming pools, sports courts, tennis courts, pickleball courts, splash pads, clubhouse, trails, pedestrian bridges, and other similar amenities beyond those required. 2. Pedestrian and Bicycle Enhancements: raised planters, bulb-outs or curb extensions, pedestrian plazas, additional bike lanes or facilities not already required. 3. Additional Open Space: beyond the required 20 percent. 4. Improvements to Master Planned Infrastructure: master planned roads, utilities, trails, property for civic buildings, or other similar items. F. Lot Sizes. There shall be no minimum lot size requirement of area, width, or depth. However, lot sizes shall be adequate to promote compatibility with adjoining activities on and off the development site as determined by the Planning Commission and City Council. G. Housing Types Allowed. Allowed housing types shall be consistent with the types of housing allowed by the underlying zoning district. The proposed locations for all houses and dwelling units, or building envelopes for all structures, shall be shown on the plat or site plan in enough detail so that compliance with the required development standards is assured. H. Building Setbacks. Along the perimeter of the development site or project area, all development shall meet the building setback standards of the underlying zoning district. Within the site, building setbacks and separation shall be established as part of the preliminary development plan approval by the reviewing and approval bodies of the City sufficient to promote a functional, attractive, and compatible development. Setbacks may be reduced but shall be sufficient to allow for the installation of all required public utilities and required driveway lengths in Table 05.030A. I. Height. The height limit of the underlying zoning district shall apply. J. Required Open Space. At least 20% of the total Planned Residential Development site shall be devoted to open space as defined in Chapter 39 of this code, or payment in lieu of open space provided. Additional density may be authorized for the provision of open space greater than the required 20% minimum. Open Space proposed for dedication may be received by the City at the discretion of the City Council. All open space shall be in common ownership, city ownership, or held in a form acceptable to the City to guarantee public access. K. Open Space Design. 1. The required open space shall be landscaped with sod and irrigation sprinklers and a minimum 25% of the proposed open space shall be water wise landscaping as defined in Chapter 39 of this Code. 2. Trees shall be provided within the open space at a rate of ten trees per acre of provided open space. Deciduous trees shall be a minimum 2” caliper and coniferous trees shall be a minimum six feet in height. 3. Detention and retention basins shall not be counted toward meeting the minimum open space requirement. Open space design and location issues shall be kept separate and independent of drainage issues. 4. Area(s) within existing power transmission easements included in the required open space shall be given half credit toward open space acreage. 5. Area(s)in existing wetlands may be given full credit toward open space acreage requirement. A minimum of 10% of the proposed open space shall be designated as useable open space, which may include, but is not limited to, boardwalks, trails, playgrounds, and parks. L. Location of Open Space. The location of open space conserved through clustered residential development shall be consistent with the policies contained in the General Plan Parks, Open Space, and Recreational Facilities Element. Required open space areas shall be contiguous, not a collection of remnants, and the majority of residential lots or units within the PRD shall abut the open space. Yard areas within lots shall not be counted toward meeting the minimum open space requirement. M. Parking. Developments shall provide adequate parking based on the requirements of Table 37.080. Including, developments with single-family detached units on lots with less than 50’ of frontage shall provide guest parking at a rate of one space for ever three dwelling units.