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Mercer Island City Zoning Code

CHAPTER 19

03 - MULTIPLE-FAMILY

19.03.010 - Multiple-family.

A.

Design requirements.

1.

Any development within the MF-2L or MF-2 zones shall comply with chapter 19.12 MICC, Design standards for zones outside Town Center.

2.

Plans for any development on property located in an MF zone shall be submitted to the design commission for its approval as set out in MICC 19.15.220. This requirement does not apply to property owned by or under the control of the city or to single-family dwellings.

B.

Uses permitted in zone MF-2L.

1.

Any use permitted in zones R-8.4, R-9.6, R-12, and R-15.

2.

Multiple-family dwellings, consisting of no more than eight dwelling units per building; provided, each building shall comply with the following conditions:

a.

Each dwelling unit shall have one or more bedrooms.

b.

The finished grade shall conceal at least one-half of the total foundation area of any daylight basement.

3.

Rooming houses, as provided in MICC 19.06.080.

C.

Uses permitted in zone MF-2.

1.

Any use permitted in zones R-8.4, R-9.6, R-12, and R-15.

2.

Multiple-family dwellings.

3.

Care services subject to the following conditions:

a.

The facility shall meet all licensing requirements prescribed by applicable federal, state, county and local law.

b.

Retirement homes shall provide one off-street parking space for every two dwelling units.

c.

Nursing homes shall provide one off-street parking space for every four beds.

d.

Daycare facilities shall provide one off-street parking space for each employee, with a minimum of two parking spaces.

4.

Civic and social organizations whose chief activity is not a service customarily carried on as business; provided, off-street parking shall be established and maintained at a minimum ratio of one parking space for each 75 square feet of gross floor area.

5.

Hotels/motels with stores therein subject to the following conditions:

a.

Off-street parking shall be established and maintained at a minimum ratio of one parking space for each sleeping unit, plus the required parking spaces for the businesses contained therein, plus one space for each full-time employee that shall be working on any single shift.

b.

Business uses must be conducted and entered entirely from within the building.

6.

Office uses subject to the following conditions:

a.

Off-street parking shall be established and maintained at a minimum ratio of one parking space for each 300 square feet of gross floor area.

b.

Business uses must be conducted and entered entirely from within the building.

c.

Not more than 45 percent of the lot area shall be covered with structures.

d.

Yard depths shall be:

i.

Front yard depth: 20 feet or more.

ii.

Side yard abutting a street: 20 feet or more.

iii.

Side yard abutting interior lot lines: five feet or more.

iv.

Rear yard depth: 25 feet or more.

7.

Accessory uses permitted outright.

a.

Single-family residential accessory uses are permitted outright.

b.

Barber shops; beauty shops; coin-operated laundries; dry cleaning pickup stations; magazine stands; business or professional offices; and other accessory services when conducted and entered entirely from within the building with no visible evidence from the outside and no exterior display or advertising except for one sign not exceeding four square feet installed flat against the principal building.

c.

Accessory uses customarily incidental to a principal use permitted outright in this section.

8.

Rooming houses, as provided in MICC 19.06.080.

D.

Uses permitted in zone MF-3.

1.

Any use permitted in zones R-8.4, R-9.6, R-12, and R-15.

2.

Multiple-family dwellings.

3.

Care services subject to the following conditions:

a.

The facility shall meet all licensing requirements prescribed by applicable federal, state, county and local law.

b.

Retirement homes shall provide one off-street parking space for every two dwelling units.

c.

Nursing homes shall provide one off-street parking space for every four beds.

d.

Daycare facilities shall provide one off-street parking space for each employee, with a minimum of two parking spaces.

4.

Rooming houses, as provided in MICC 19.06.080.

E.

Building height limit.

1.

MF-2, MF-3: No building shall exceed 36 feet or three stories in height, whichever is less, except appurtenances may extend to a maximum of five feet above the height allowed for the main structure.

2.

Building height for buildings within the MF-2 and MF-3 zones shall be calculated using the method described in MICC 19.11.030(A)(3).

3.

Buildings within the MF-2L zone shall meet the following standards:

a.

No building shall exceed 24 feet in height above the average building elevation to the highest point of the roof; and

b.

The maximum building facade height on the downhill side of a sloping lot shall not exceed 24 feet in height. The building facade height shall be measured from the existing grade or finished grade, whichever is lower, at the furthest downhill extent of the proposed building, to the top of the exterior wall facade supporting the roof framing, rafters, trusses, etc.

F.

Density and lot requirements.

1.

In the MF-2 district, the maximum allowed density is 38 dwelling units per acre.

2.

In the MF-3 and MF-2L districts, the maximum allowed density is 26 units per acre.

3.

Lot width shall be at least 60 feet, and lot depth shall be at least 80 feet.

4.

For townhouse lots:

a.

The maximum number of townhouse lots shall be determined by the density requirements in subsections (F)(1) and (2) of this section;

b.

The minimum lot area shall be 1,000 square feet in the MF-2 district;

c.

The minimum lot area shall be 1,500 square feet in the MF-3 and MF-2L districts;

d.

The requirements of subsection (F)(3) of this section shall not apply.

G.

Yard requirements. Except as provided elsewhere in this section, each lot shall have front, side and rear yards not less than the depths or widths following or as approved by the design commission:

1.

Front yard depth: 20 feet.

2.

Rear yard depth: 25 feet.

3.

Side yard depth: 20 feet provided the side yard depth may be reduced to ten feet when adjacent to an MF, B, CO, PBZ or TC zone.

4.

For townhouse lots:

a.

The front yard depth can be reduced to ten feet when:

i.

The front yard is adjacent to a perimeter street right-of-way and a driveway is not located in the front yard; or

ii.

The front yard is oriented to a front, side or rear yard on an adjoining townhouse lot.

b.

No front yard depth is required when adjacent to a street right-of-way, tract or easement located internally on a development site.

c.

The rear yard depth can be reduced to ten feet when adjacent to a rear, side, or front yard on an adjoining townhouse lot.

d.

No side yard is required on adjoining townhouse lots.

e.

Required yards can be located in a tract or easement that is within the development site and adjacent to the lot. Nothing in this subsection (G)(4)(e) shall result in the reduction in depth, width, size or location of any of the foregoing required yards.

H.

Lot coverage. Except as otherwise provided in this section, not more than 35 percent of any lot shall be covered with structures. For townhouse developments, the lot coverage on an individual townhouse lot can exceed 35 percent provided that not more than 35 percent of the entire development site is covered with structures.

(Ord. 19C-21 § 1 (Att. A); Ord. 08C-01 § 2; Ord. 06C-04 § 1; Ord. 04C-08 § 10; Ord. 03C-08 § 4; Ord. 01C-09 § 1; Ord. 00C-01 § 1; Ord. 99C-13 § 1)

19.03.020 - Parking requirements.

A.

Parking lot dimension. All parking areas shall conform to the design standards set out in appendix A of this development code unless alternative design standards are approved by the design commission and city engineer. Residential uses are subject to the provisions of MICC 19.03.020(C).

B.

Except as otherwise provided in this chapter, each lot shall also meet the following parking requirements.

1.

Off-street parking shall be established and maintained at a minimum ratio of two parking spaces for each unit in a multiple-family dwelling.

2.

Parking shall not be allowed in front yard setbacks.

3.

Group parking areas shall be screened from view from streets and adjoining properties. If screening consists of solid planting, it shall be of evergreen variety and shall constitute a solid planting within two years.

4.

Notwithstanding any of the minimum parking requirements set out in this subsection, the code official may grant variances from the minimum parking requirements with the approval of the city engineer and the design commission for projects reviewable by the design commission.

5.

All off-street parking areas shall be graded and surfaced to a standard comparable to the street which serves the parking area. The parking area shall be developed and completed to the required standards before an occupancy permit for the building to be served is issued. All traffic control devices such as parking strips designating car stalls, directional arrows or signs, bull rails, curbs and other structures shall be installed and completed as shown on the approved plans. Hard surfaced parking area shall use paint or similar devices to delineate parking stalls and directional arrows.

6.

Off-street parking shall be located on the same lot or on an adjoining lot or lots to the building to be served, except that off-street parking may be located in an area beginning within 500 feet of the front entrance of the building to be served; provided, there are no intersecting streets between the parking area and building to be served.

7.

The city engineer shall have the authority to fix the location and width of vehicular entrances and exits to and from property, and to alter existing entrances and exits as may be required to control street traffic in the interest of public safety and general welfare.

8.

Off-street parking shall meet the relevant state design standards for the physically handicapped.

9.

Up to 50 percent of the required off-street parking spaces may be designed for accommodating compact vehicles. Such parking spaces shall be clearly designated as compact stalls. The design commission may increase the percentage of compact stalls permitted if the applicant can demonstrate that no adverse impacts will occur.

C.

Residential development parking standards.

1.

Garages and carports are not required in order to meet minimum parking requirements for residential development.

2.

Parking spaces that count towards minimum parking requirements may be enclosed or unenclosed.

3.

Parking spaces in tandem shall count towards meeting minimum parking requirements at a rate of one space for every 20 linear feet with any necessary provisions for turning radius. For purposes of this subsection, "tandem" is defined as having two or more vehicles, one in front of or behind the others with a single means of ingress and egress.

4.

Existence of legally nonconforming gravel surfacing in existing designated parking areas may not be a reason for prohibiting utilization of existing space in the parking area to meet parking standards, up to a maximum of six parking spaces.

5.

Parking spaces are not required to exceed eight feet by 20 feet, except for required parking for people with disabilities.

6.

Required off-street parking shall not be a condition of permitting a residential project if compliance with tree retention pursuant to the requirements of MICC Chapter 19.10 would otherwise make a proposed residential development or redevelopment infeasible.

7.

Parking spaces that consist of grass block pavers may count toward minimum parking requirements.

8.

Existing parking spaces that do not conform to the requirements of this section by June 6, 2024 are not required to be modified or resized, except for compliance with the Americans with Disabilities Act. Existing paved parking lots are not required to change the size of existing parking spaces during resurfacing if doing so will be more costly or require significant reconfiguration of the parking space locations.

(Ord. 99C-13 § 1; Ord. No. 24C-08, § 3(Exh. B), 6-4-2024)