96 MULTIFAMILY HOUSING DESIGN STANDARDS
![]() Example: Net Site Area. The net site area (crosshatched in this illustration) excludes critical areas, such as wetlands, but includes critical area buffers. |
Net Site Area = Total Site Area – Critical Areas |
Net Site Area = 10 Acres – 2 Acres = 8 Acres |
Net Site Area/Minimum Lot Size = Maximum # of Allowed Units |
8 Acres (348,480 Square Feet) / 2,200 sf = 158 Units |
![]() Example: This building is located facing the street with a prominent entrance and pedestrian path to the sidewalk. |
![]() Figure: RMH – Multiple-Family Residential District. Building height adjacent to a single-family (RS) zone is limited to 35 feet within 10 feet of the required side or rear setback, then may increase at no more than five vertical feet for each 10 horizontal feet up to a building height of 45 feet. |
![]() Figure: Abutting Townhouse or Residential Medium Designations. Diagram illustrating height requirements and allowances for multifamily and residential mixed use projects abutting parcels with townhouse and residential medium comprehensive plan land use designations. |
![]() Figure 20.96.350A. Parking Garage Entrance |
![]() Figure 20.96.350B. Screening Parking at Grade |
Unit Size | Minimum Required Recreation Space |
|---|---|
2-bedroom or larger | 200 square feet |
1-bedroom | 160 square feet |
Studio | 120 square feet |
MC – Commercial Residential Mixed Use District | |
Per unit | 60 square feet |
General Requirements | MC District | |
|---|---|---|
OUTDOOR RECREATION SPACE | ||
Outdoor Common Space | Minimum 50% | Minimum 75% |
Play Areas | Amount equivalent to 50% of minimum required recreation space for 2-bedroom+ units *Not required for retirement apartments or assisted living facilities | Optional |
Outdoor Single-Purpose Space | Up to 50% | Not counted |
INDOOR RECREATION SPACE | ||
Indoor Common Space | Up to 50% | Up to 25% |
PRIVATE RECREATION SPACE | ||
Private Balconies/Patios | Up to 50% | Up to 25% |
![]() Example: Pedestrian corridor with five-foot landscaping strip within side setback area. |
![]() Figure: Example of pedestrian corridor configurations. |
Site/Development Criteria | Reduction | |
|---|---|---|
Park Availability (All projects) | Projects within one-quarter mile walking distance of public parks with playgrounds, which are accessible without crossing arterial streets. | Projects under 100 Units: Minimum recreation space requirements in PMC § 20.96.410 are met when: • Private recreation space is provided for each unit per PMC § 20.96.440. |
Projects with 100+ Units: Minimum recreation space requirements in PMC § 20.96.410 are met when: • Fifty percent of the minimum outdoor common space required per PMC § 20.96.410 is provided. • Private recreation space is provided for each unit per PMC § 20.96.440. | ||
Small Projects (All projects) | Projects under 15 units. Phased projects that would result in more than 14 units are not eligible. | Option 1: Minimum recreation space requirements in PMC § 20.96.410 are met when: • Outdoor common space is provided as required per PMC § 20.96.410. |
Option 2: Minimum recreation space requirements in PMC § 20.96.410 are met when: • Private recreation space is provided for each unit per PMC § 20.96.440. • Only one option may be utilized. | ||
Mixed Use (All projects) | Projects which meet the mixed use definition and standards in Chapter 20.51 PMC, Mixed Use Development Design Standards. | Projects under 100 Units: Minimum recreation space requirements in PMC § 20.96.410 are met when: • Private recreation space is provided for each unit per PMC § 20.96.440. |
Projects with 100+ Units: Minimum recreation space requirements in PMC § 20.96.410 are met when: • Fifty percent of the minimum outdoor common space required per PMC § 20.96.410 is provided. • Private recreation space is provided for each unit per PMC § 20.96.440. | ||
Projects with Recreation Space Requirements Exceeding 20 Percent of Site Area (Outside of MC district) | Projects located outside of overlay districts, where the square footage of the minimum area requirement in PMC § 20.96.410(B) exceeds 20 percent of the project's net site area. Net Site Area Definition: • "Net site area" is defined, per PMC § 20.96.050, Density calculation, as the total site minus any areas that are classified as critical areas. (Buffers for critical areas are not deducted but rather are included as part of the net site area.) | 20 Percent Cap on Recreation Space: The amount of recreation space required in PMC § 20.96.410 is capped at 20 percent of net site area when the following requirements are met: • Outdoor common space is provided as required per PMC § 20.96.410. • Play area space is provided as required per PMC § 20.96.410. |
When the square footage of the required outdoor common space and play area is less than 20 percent: Additional recreation space is required up to 20 percent of net site area. | ||
When the square footage of the required outdoor common space and play area is more than 20 percent: The amount of required recreation space is adjusted to provide a maximum of 20 percent of net site area as outdoor common space, with 1,000 SF configured as play area. |
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BENEFIT | DEVELOPMENT INCENTIVE |
|---|---|
SENIOR HOUSING Intent: Encourage the provision of senior housing within the community to allow for a variety of housing options to aging persons as their family size and housing needs change. This incentive is not applicable to projects whose sole purpose is housing intended for seniors (age 55 years or older) (i.e., adult family homes, assisted living facilities, continuing care retirement communities, retirement apartments, convalescent center/nursing homes, etc.). | Density Bonus. A 20 percent increase in the allowed number of units shall be permitted when a minimum of 35 percent of the units within the project are reserved as assisted living units or retirement apartments. |
Height Bonus. A five-foot increase in the maximum allowed height shall be permitted when a minimum of 35 percent of the units within the project are reserved as assisted living units or retirement apartments. | |
MIXTURE OF UNIT SIZES Intent: Promote a mixture of unit sizes within a development, in order to encourage the presence of residents during the daytime. Larger units typically house families, where an adult may be present during the daytime. Having a mixture of unit sizes can contribute to a more secure community. | Density Bonus. A 10 percent increase in the allowed number of units shall be permitted with a mixture of unit sizes in a development with at least 35 percent of the units being two bedroom or larger. |
Height Bonus. A five-foot increase in the allowed height shall be permitted with a mixture of unit sizes in a development with at least 35 percent of the units being two bedroom or larger. | |
CONDOMINIUM/OWNER-OCCUPIED HOUSING Intent: Encourage units to be constructed as condominiums, and remain owner-occupied through codes, conditions, and restrictions (CCRs) or other restrictive covenants, contributing to a sense of ownership, investment in the community, and stability in the resident population of multifamily areas. | Density Bonus. A 30 percent increase in the allowed number of units shall be permitted for a condominium development, where the codes, conditions, and restrictions (CCRs) of the homeowners' association or other restrictive covenants are set up to maintain home ownership within the development and restrict the number of units that may be used as rental properties. CCRs shall be reviewed and approved by the Director prior to recording to ensure this provision cannot be modified or eliminated. |
Height Bonus. A 10-foot increase in the allowed building height shall be permitted for a condominium development, where the codes, conditions, and restrictions (CCRs) of the homeowners' association or other restrictive covenants are set up to maintain home ownership within the condominium and restrict the number of units that may be used as rental units. CCRs shall be reviewed and approved by the Director prior to recording to ensure this provision cannot be modified or eliminated. | |
UNDERGROUND PARKING Intent: Promote the placement of parking underground in order to facilitate urban spaces, pedestrian orientation, and greater efficiency in use of land for housing and open space. | Density Bonus. A 10 percent increase in the allowed number of units shall be permitted for developments where a minimum of 75 percent of the parking is placed underground. |
Height Bonus. A five-foot increase in the allowed building height shall be permitted for developments where a minimum of 25 percent of the parking is placed underground. | |
OUTDOOR RECREATION SPACE Intent: Encourage the placement of additional recreation space throughout multifamily developments in order to enhance outdoor recreational opportunities for residents. | Density Bonus. A 10 percent increase in the allowed number of units shall be permitted when at least 15 percent additional outdoor recreation space over what is required is provided within a multifamily development. |
Height Bonus. A five-foot increase in the allowed building height shall be permitted when at least 15 percent additional outdoor recreation space over what is required is provided within a multifamily development. | |
ARCHITECTURAL DESIGN Intent: Promote enhanced building layout and design in multifamily buildings through the incorporation of additional design elements and features. The enhanced design elements shall consist of the following: 1. Incorporate all methods of facade variation identified in PMC § 20.96.620(B). 2. Incorporate three or more roofline variations identified in PMC § 20.96.620(F). | Density Bonus. A 10 percent increase in the allowed number of units shall be permitted when additional building design is provided within a multifamily development. |
Height Bonus. A five-foot increase in the allowed building height shall be permitted when additional building design is provided within a multifamily development. | |
LOW INCOME HOUSING Intent: Encourage the provision of low income housing within the community. Low income is defined as a person or family earning a maximum income from all sources at 80 percent of the median income in King County with rents adjusted accordingly for the low income units. | Density Bonus. A 20 percent increase in the allowed number of units shall be permitted when a minimum of 20 percent of the units within the project are reserved as low income apartments. |
Height Bonus. A five-foot increase in the maximum allowed height shall be permitted when a minimum of 20 percent of the units within the project are reserved as low income apartments. |