21.08.130 R-20 Multifamily Urban Residential.
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 |
---|
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 |
|
F |
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 |
||
---|---|---|
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 |
C. Regulations Common to All Uses.
Table 21.08.130B |
|||
---|---|---|---|
Regulation |
Standard |
Exceptions |
|
Minimum |
Average Lot Size |
N/A |
|
Required Density |
65 percent of net acres |
||
Lot Width Circle |
N/A |
||
30 feet |
|||
Front |
20 feet |
||
Side / Interior (each side) |
15 feet |
5 feet for detached dwelling units |
|
Side Street |
15 feet |
||
Rear |
10 feet |
||
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. |
|
20 percent of total lot area |
|||
Landscaping |
50 percent of total lot area |
||
Maximum |
60 percent of total lot area |
||
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 |
|||
---|---|---|---|
Section |
Use |
Parking Ratio: |
Special Regulations |
Residential1 |
|||
1 |
Dwelling unit (2.0) |
||
2 |
|||
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 |
|||
6 |
Dwelling unit (2.0) |
See RZC 21.08.320, Designated Manufactured Homes, Manufactured Homes, and Mobile Homes, for specific regulations which may apply. |
|
7 |
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 |
Dwelling unit (2.0) |
||
Transportation, Communication, Information, and Utilities |
|||
9 |
Adequate to accommodate peak use. |
||
10 |
A Conditional Use Permit is required. |
||
11 |
N/A |
A Conditional Use Permit is required. Does not include medical airlift. Permitted only abutting Lake Sammamish. |
|
12 |
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 |
See RZC 21.56, Wireless Communication Facilities, for specific development requirements. |
|
15 |
Adequate to accommodate peak use. |
Includes noncommercial indoor recreation uses, such as community clubhouses, indoor swimming pools, and other similar facilities. |
|
16 |
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 |
|||
20 |
|||
Education, Public Administration, Health Care, and Other Institutions |
|||
21 |
Employee (1.0) |
A Conditional Use Permit is required. See RZC 21.08.310, Day Care Centers, for specific regulations which may apply. |
|
22 |
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 |
Adequate to accommodate peak use |
A Conditional Use Permit is required. |
|
24 |
Grade schools (K-12) |
||
25 |
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 |
Vehicle used by the business (1.0). |
See RZC 21.08.340, Home Business, for specific regulations which may apply. |
|
27 |
N/A |
||
28 |
See RZC 21.68.070, In-Water Structures, for special height, setback and area requirements, (SMP) |
||
29 |
See RZC 21.68.070.G, Water-Oriented Accessory Structures, for special height, setback and area requirements. (SMP) |
Notes:
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.