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A. General. Within a Planned Unit Development including residential uses:

1. Through the conservation design features included in subsection B of this section, the proposal must earn square footage credit totaling at least 40 percent of the gross land area, which includes any critical area or critical area buffer; and

2. At least 10 percent of the gross land area, which includes any critical area or critical area buffer, of the subject property must be retained or developed as common recreation space as defined by LUC 20.50.044; provided, however, that the requirement for recreation space may be waived if the total of critical area and critical area buffer equals at least 40 percent of the gross land area; and

3. Recreation space as required by subsection A.2 of this section may be included within non-critical area conservation design features required by subsection A.1 of this section if:

a. The common recreation space does not interfere with the purposes and functions of the conservation design feature; and

b. At least 20 percent of the gross land area is nonrecreation open space.

Provided, however, that recreation space may not occur in a critical area or a critical area buffer; and

4. The area of the site devoted to pedestrian trails shall not be included in the required common recreation space unless public trails are specifically required by the City; and

5. An outdoor children’s play area meeting the requirements of LUC 20.20.540 may be included in the above-described common recreation space requirement; and

6. For mixed use projects, the required open and recreation space shall be designed to meet the needs of both the residential and commercial uses.

B. Conservation Design Features. To satisfy the requirements of subsection A of this section, a proposal shall include any combination of the following factors. The total square footage credit required in subsection A of this section is calculated by multiplying the square footage actually dedicated to the conservation design feature by the conservation factor set forth below. Where noted, certain conservation design features are not eligible to earn square footage credit unless the minimum size requirements are met. After the minimum size requirement is met, each square foot provided may be used to calculate the square footage credit earned by the feature.

Conservation Design Feature

Conservation Factor

Minimum Size of Retained Area Before Credit Earned

Critical area or areas placed in a tract (connection between isolated critical areas credited as corridor below)


Preservation of Westside lowland conifer hardwood forest not already in critical area and/or preservation of recommended forest habitat to protect species of local importance


20,000 sq. ft.

Designated wildlife corridor, trail or other essential connection set aside in a tract


Critical area buffer increased by 15% or more and placed in tract


Preservation of native soils and mature trees on required open space or combination of preservation with hydrologic enhancement (soil amendment and tree such that vegetative areas are connected to soil below)


10,000 sq. ft. canopy cover or amended and planted area

Site area set aside in separate tract to achieve bio-retention and runoff dispersion to natural areas or to soil layer below; e.g., community rain garden, downspout dispersion or similar LID techniques. Must serve more than one residence.


5,000 sq. ft. reserved for rain garden or dispersion

Landscaped or grass open space in separate tract for active or passive recreation but only partially connected to soil below


2,500 sq. ft. contiguous area

Paved but pervious open space; e.g., court yards and similar facilities


1,500 sq. ft.

Impervious paved court yards and similar facilities that meet minimum definition of open space


2,500 sq. ft.

Built Green certification for green communities


200 points earned under Built Green’s “Site Design Criteria.” For sites with critical areas, proposal must achieve all of the available points from the open space and habitat preservation sections as part of the total 200 points

C. Maintenance. In appropriate circumstances the City may require a reasonable performance or maintenance assurance device in conformance with LUC 20.40.490 to assure the retention and continued maintenance of all open and recreation space or conservation design feature in conformance with the Land Use Code and the Planned Unit Development plan approval. (Ord. 5682, 6-26-06, § 11; Ord. 4972, 3-3-97, § 50; Ord. 4816, 11-27-95, § 149; Ord. 3775, 5-26-87, § 20)