21.08.130 R-20 Multifamily Urban Residential

21.08.130 R-20 Multifamily Urban Residential.

This section was recently amended by Ordinance 3059, codified in October 2021. This section was recently amended by Ordinance 3074, codified in April 2022.

A. Purpose. The R-20 Multifamily Urban Residential zone provides for multifamily residential neighborhoods on lands suitable for residential development with an allowed base density of 20 dwellings per gross acre. This designation provides for stable and attractive residential neighborhoods which have an urban character and a full range of public services and facilities. To complement the primarily residential nature of these zones, some nonresidential uses are allowed.

Figure 21.08.130 Typical R-20 Layouts
This sketch represents maximum allowance for structures, impervious surface & setbacks

LEGEND
A	FRONT SETBACK MINIMUM 20'-0"
B	SIDE STREET SETBACK MINIMUM 15'-0"
C	SIDE INTERIOR SETBACK 15'-0" (5'-0" FOR DETACHED HOUSING)
D	REAR SETBACK MINIMUM 10'-0"
E	LOT FRONTAGE MINIMUM 30'-0"
F	ALLOWED PROJECTION OF BUILDING EXTREMITIES INTO SETBACK

B. Maximum Development Yield. The following calculation provides a potential maximum development yield for a development utilizing the density bonuses available for the R-20 zone. The calculation is based on a development occurring on a one-acre lot. Please note that accessory dwelling units do not count toward maximum development yield.

Table 21.08.130A Maximum Development Yield
Base Density	Available Density Bonuses	Maximum Density
20 dwelling units per gross acre	Green Building/Green Infrastructure Development: Up to 10 percent of base density	2.0 dwelling units allowed
	Affordable Housing: Up to 15 percent of base density	3.0 dwelling units allowed
		Total = 25 dwelling units per gross acre

Table 21.08.130B Regulations Common to All Uses
	Regulation	Standard	Exceptions
Minimum	Average Lot Size	N/A
	Required Density	65 percent of net acres
	Lot Width Circle	N/A
	Lot Frontage	30 feet
	Setbacks
	Front	20 feet
	Side / Interior (each side)	15 feet	5 feet for detached dwelling units
	Side Street	15 feet
	Rear	10 feet
	Alley	4 feet
	Lake Sammamish	35 feet
	Building Separation	15 feet	6 feet for single-family dwellings. 10 feet for 2-unit to 4-unit attached dwelling units.
	Open Space	20 percent of total lot area
	Landscaping	50 percent of total lot area
Maximum	Lot Coverage for Structures	60 percent of total lot area
	Impervious Surface	75 percent of total lot area
	Building Height	60 feet	30 feet in Shoreline Jurisdiction
	Drive-through	n/a	Drive-through facilities are prohibited except where expressly permitted in the Allowed Uses and Special Regulations table below.

D. Allowed Uses and Special Regulations. The following table contains special zoning regulations that apply to uses in the R-20 zone. To use the chart, first read down the left-hand column titled “Use.” When you have located the use that interests you, read across to find regulations that apply to that use. Uses are permitted unless otherwise specified in the Special Regulations column. Permitted uses may require land use permit approval. See RZC 21.76.020, Overview of the Development Process, for more information. Uses not listed are not permitted.

Table 21.08.130C Allowed Uses and Special Regulations
Section	Use	Parking Ratio: unit of measure (minimum required; maximum allowed)	Special Regulations
Residential¹
1	Detached dwelling unit	Dwelling unit (2.0)
2	Size-limited dwelling	Dwelling unit (2.0)
3	Accessory dwelling unit (ADU)	ADU (1.0)	See RZC 21.08.220, Accessory Dwelling Units, for specific regulations which may apply.
4	Attached dwelling unit, 2-4 units	Studio dwelling unit (1.2) 1-bedroom dwelling unit (1.5) 2-bedroom dwelling unit (1.8) 3+-bedroom dwelling unit (2.0)	A. Permitted use in all neighborhoods. B. Please see RZC 21.08.260, Attached Dwelling Units, for specific regulations related to density, design, review and decision procedures, and affordable housing exceptions.
5	Multifamily structures
6	Manufactured home	Dwelling unit (2.0)	See RZC 21.08.320, Designated Manufactured Homes, Manufactured Homes, and Mobile Homes, for specific regulations which may apply.
7	Housing Services for the Elderly	See Special Regulations	A. Retirement residences are permitted through a subdivision or binding site plan with a maximum of 16 retirement residence units per acre. Without a subdivision or binding site plan, a Conditional Use Permit is required. See RZC 21.08.360, Retirement Residences, for specific regulations which may apply. B. A Conditional Use Permit is required for Residential Care Facilities. C. A Conditional Use Permit is required for Long-Term Care Facilities. D. Parking requirements are as follows: 1. Multifamily housing for senior citizens: Unit (0.5, 2.0) 2. Nursing home or long-term care facility: four patient beds (1.0, 1.0) 3. Retirement residence with no skilled nursing facility: Unit (1.0, 1.0) 4. Retirement residence with skilled nursing facility: Worker on largest shift (1.25, 1.25) E. For Retirement Residences, a Traffic Mitigation Plan is required. See RZC 21.08.370.C.3.b.iii.
8	Adult family home	Dwelling unit (2.0)
Transportation, Communication, Information, and Utilities
9	Local utilities	Adequate to accommodate peak use.
10	Regional utilities	Adequate to accommodate peak use.	A Conditional Use Permit is required.
11	Heliport	N/A	A Conditional Use Permit is required. Does not include medical airlift. Permitted only abutting Lake Sammamish.
12	Float plane facility	N/A	A. A Conditional Use Permit is required. Permitted only abutting Lake Sammamish. B. Piers, docks, and floats associated with the operation of float planes shall meet, as a minimum, the location criteria contained in RZC 21.68.070, In-Water Structures. Piers and docks are also subject to standards for residential piers and docks contained in RZC 21.68.070.E, Piers, Docks, and Floats. (SMP) C. Only one float plane per lot is permitted. (SMP) D. Float planes shall observe speed regulations for watercraft and vessels contained in RMC 14.16.030, Speed Regulations, except that these speeds may be exceeded for a short duration of time during landing and takeoff of planes. (SMP) E. Float plane facilities or operation of float planes is prohibited on the Sammamish River, Bear Creek and Evans Creek. (SMP) F. Float plane facilities and operation shall comply with FAA standards, including standards for fueling, oil spill cleanup, firefighting equipment, and vehicle and pedestrian separation. (SMP)
13	Wireless Communication Facilities	N/A	See RZC 21.56, Wireless Communication Facilities, for specific development requirements.
Arts, Entertainment, and Recreation
15	Community indoor recreation	Adequate to accommodate peak use.	Includes noncommercial indoor recreation uses, such as community clubhouses, indoor swimming pools, and other similar facilities.
16	Parks, open space, trails and gardens	1,000 sq ft gfa (0, adequate to accommodate peak use)	Permitted if public or noncommercial. A Conditional Use Permit is required for commercial facilities.
17	Athletic, sports, and play fields	Adequate to accommodate peak use.	A Conditional Use Permit is required.
18	Golf course
19	Marine recreation
20	Commercial swimming pool
Education, Public Administration, Health Care, and Other Institutions
21	Day care center	Employee (1.0)	A Conditional Use Permit is required. See RZC 21.08.310, Day Care Centers, for specific regulations which may apply.
22	Family day care provider	Vehicle used by the business (1.0).	Family day care providers are permitted as home businesses. See RZC 21.08.340, Home Business, for specific regulations which may apply.
23	Public safety	Adequate to accommodate peak use	A Conditional Use Permit is required.
24	Grade schools (K-12)	Adequate to accommodate peak use	A Conditional Use Permit is required.
25	Religious Institution	1,000 sq ft gfa for assembly (1.0) or 5 fixed seats (1.0); 3 seats (1.0).	A. Permitted use if less than 250 seats. A Conditional Use Permit is required for religious institutions with between 250 and 750 seats. See RZC 21.08.280, Churches, Temples, Synagogues and Other Places of Worship, for specific regulations which may apply. B. A Traffic Mitigation Plan is required. See RZC 21.08.280.C.5.
Other
26	Home Business	Vehicle used by the business (1.0).	See RZC 21.08.340, Home Business, for specific regulations which may apply.
27	Roadside produce stand	N/A
28	Pier, dock, float		See RZC 21.68.070, In-Water Structures, for special height, setback and area requirements, (SMP)
29	Water-oriented accessory structure		See RZC 21.68.070.G, Water-Oriented Accessory Structures, for special height, setback and area requirements. (SMP)

1Permanent supportive housing, as defined under RCW 36.70A.030, and transitional housing, as defined under RCW Chapter 84.36, are allowed in all land use districts where residential dwellings and/or hotel uses are allowed, subject to RZC 21.57.010,Permanent Supportive Housing, Transitional Housing, and Emergency Housing.