Chapter 19.05
SPECIAL PURPOSE

Sections:

19.05.010    Public institution – P.

19.05.020    Parking requirements.

19.05.010 Public institution – P.

A. Uses Permitted.

1. Government services.

2. Public schools under the administration of Mercer Island School District No. 400 subject to the requirements in subsection F of this section. Subsections B, C and E of this section do not apply to public schools. Uses other than public schools located on land owned by the Mercer Island School District shall comply with applicable provisions of Chapter 19.02 MICC.

3. Public park.

4. Transit facilities including transit stops and associated parking lots.

5. On-site hazardous waste treatment and storage facilities are allowed as accessory uses to a use permitted in this zone. These facilities shall comply with the state siting criteria as set forth in Chapter 173-303 WAC.

6. Wireless communications facilities subject to the conditions set out in MICC 19.06.040.

B. Mercer Island I-90 Right-of-Way Added to Public Institution Zone. The entire area within the Mercer Island I-90 right-of-way, including, but not limited to, the roadway, street overcrossings, lids, open space, recreation areas, linear greenbelts and the park-and-ride lot area as approved by the city on November 14, 1983, and incorporated in the right-of-way plan approved by WSDOT on May 1, 1987, shall be part of the public institution zone. All uses within the I-90 right-of-way shall be maintained as set forth in city-approved I-90 related documents.

C. Design Requirements. Any development within the public institution zone shall comply with the applicable sections of Chapter 19.11 MICC, Town Center Development and Design Standards.

D. Parking Requirements. All uses permitted in this zone shall comply with the parking requirements set out in MICC 19.05.020.

E. Structures, excluding stacks, shall not exceed 36 feet or three stories in height, whichever is less; provided, the height of buildings located on sites exceeding five acres may be increased by 12 feet or one story, whichever is less, for each additional two and one-half acres of area when specifically approved by the city council upon recommendation of the design commission in accordance with the following conditions:

1. Approval by the Federal Aviation Administration.

2. Adequate provision for ultimate off-street parking needs.

F. Public Schools. The following requirements apply to public schools:

1.

Islander Middle School

Minimum Setback

Height Limit

Special Conditions

From public right-of-way

30 feet

Two stories, 43 feet1

Minimum setback of 15 feet is allowed from SE 78th Street.

From public park

15 feet

Two stories, 43 feet1

 

From property lines abutting single-family zoned property

65 feet

Two stories, 30 feet

Additional height is allowed up to 43 feet above average building elevation (or up to 48 feet as allowed by Footnote 1) with an additional setback of 2.5 feet for each additional 1 foot in height, for the portion of the structure exceeding 30 feet above average building elevation.

 

Lakeridge Elementary

Minimum Setback

Height Limit

Special Conditions

From public right-of-way

30 feet

Two stories, 43 feet1

Minimum setback from SE 78th Street is 15 feet.

From west property line abutting single-family zoned property

65 feet

Two stories, 30 feet

Additional height is allowed up to 43 feet above average building elevation (or up to 48 feet as allowed by Footnote 1) with an additional setback of 2.5 feet for each additional 1 foot in height, for the portion of the structure exceeding 30 feet above average building elevation.

 

From all other property lines abutting single-family zoned property

45 feet

Two stories, 30 feet

Additional height is allowed up to 43 feet above average building elevation (or up to 48 feet as allowed by Footnote 1) with an additional setback of 2.5 feet for each additional 1 foot in height, for the portion of the structure exceeding 30 feet above average building elevation.

 

Island Park Elementary

Minimum Setback

Height Limit

Special Conditions

From eastern 350 feet of the northern property line abutting SE 53rd Place

45 feet

Two stories, 30 feet

Additional height is allowed up to 43 feet above average building elevation (or up to 48 feet as allowed by Footnote 1) with an additional setback of 2.5 feet for each additional 1 foot in height, for the portion of the structure exceeding 30 feet above average building elevation.

The perimeter screen required by MICC 19.12.040(B)(7) along SE 53rd Place shall be a full screen.

From other public right-of-way

30 feet

Two stories, 43 feet1

The perimeter screen required by MICC 19.12.040(B)(7) along SE 53rd Place shall be a full screen.

From public park or internal property line

15 feet

Two stories, 43 feet1

 

From property lines abutting single-family zoned property

45 feet

Two stories, 30 feet Additional height is allowed up to 43 feet above average building elevation (or up to 48 feet as allowed by Footnote 1) with an additional setback of 2.5 feet for each additional 1 foot in height, for the portion of the structure exceeding 30 feet above average building elevation.

 

West Mercer Elementary

Minimum Setback

Height Limit

Special Conditions

From public right-of-way

30 feet

Two stories, 43 feet1

 

From public park or internal property line

15 feet

Two stories, 43 feet1

 

From west property line abutting parcel numbers 3623500187 and 3623500184

45 feet

Two stories, 43 feet1

 

From property lines abutting other single-family zoned property

45 feet

Two stories, 30 feet

Additional height is allowed up to 43 feet above average building elevation (or up to 48 feet as allowed by Footnote 1) with an additional setback of 2.5 feet for each additional 1 foot in height, for the portion of the structure exceeding 30 feet above average building elevation.

 

New Elementary School No. 4

Minimum Setback

Height Limit

Special Conditions

From public right-of-way

30 feet

Two stories, 43 feet1

 

From internal property line

15 feet

Two stories, 43 feet1

 

Mercer Island High School

Minimum Setback

Height Limit

Special Conditions

From public right-of-way

30 feet

Three stories, 48 feet1

Additional height is allowed up to 53 feet above average building elevation (or up to 58 feet as allowed by Footnote 1) with an additional setback of 1.5 feet for each additional 1 foot in height, for the portion of the structure exceeding 48 feet above average building elevation.

 

From public park or internal property line

15 feet

Three stories, 53 feet1

 

From property lines abutting single-family zoned property

45 feet

Three stories, 30 feet

Additional height is allowed up to 53 feet above average building elevation (or up to 58 feet as allowed by Footnote 1) with an additional setback of 2.5 feet for each additional 1 foot in height, for the portion of the structure exceeding 30 feet above average building elevation.

 

1 Additional 5 feet in height is allowed for a roof that is enclosing mechanical equipment; roof-mounted mechanical equipment and its screening; gymnasiums; and Mercer Island High School fly-loft.

2. Impervious Surface. Maximum allowable coverage with impervious surface is 55 percent for elementary and middle schools and 63 percent for the high school mega-block. An additional five percent of impervious surface coverage is allowed if the additional coverage is synthetic turf fields that allow for water percolation; pervious concrete, pervious asphalt or pervious pavers in areas not designed for vehicular use; or pervious fire lanes not available for general public use.

3. Green Building. New, expanded and remodeled school facilities shall comply with Chapter 39.35D RCW, High Performance Public Buildings.

4. Review Process.

a. Major new construction (except portable classrooms) requires design commission review pursuant to MICC 19.15.040.

b. Minor exterior modification and portable classrooms require administrative design review pursuant to MICC 19.15.040. (Ord. 14C-09 § 1; Ord. 14C-06 §§ 1 – 3; Ord. 99C-13 § 1).

19.05.020 Parking requirements.

A. The following parking requirements apply to all uses in the P zone.

B. General Requirements.

1. Surfacing and Grading. 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.

2. Traffic Control Devices. 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 areas shall use paint or similar devices to delineate parking stalls and directional arrows.

3. Design. Parking lot design should conform to the diagrams set out in Appendix A of this development code, unless alternative design standards are approved by the design commission and city engineer.

4. Location. 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, that there are no intersecting streets between the parking area and building to be served. This requirement does not apply to transit facilities.

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

6. Handicapped Standards. Off-street parking shall meet the relevant state design standards for the physically disabled.

7. Compact Vehicles. Up to 50 percent of the required off-street parking spaces may be designed for accommodating compact vehicles. Such parking spaces must 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.

8. Loading Space. An off-street loading space, having access to a public street, shall be required adjacent to each building hereafter erected or enlarged. Such loading space shall be of adequate size to accommodate the maximum number and size of vehicles simultaneously loaded or unloaded, in connection with the business or businesses conducted in such building. No part of the truck or van using the loading space may project into the public right-of-way.

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

C. Minimum Parking Requirements for Specific Uses.

1. Government buildings shall provide one parking space per 200 square feet of gross floor area.

2. Public elementary and middle schools shall provide a minimum of two parking spaces per classroom. Public high schools shall provide a minimum of one parking space per classroom plus an additional one parking space per 10 students. If the parking spaces that would need to be provided as specified above are in excess of the actual parking demands of the school’s staff, students, and visitors, the code official may allow a reduction in minimum parking requirements based on a parking analysis prepared by a qualified professional, with the approval of the city engineer and the design commission, for projects reviewable by the design commission.

D. Mixed Use Parking. In the case of mixed uses, the total requirements for off-street parking facilities shall be the sum of the requirements for the various uses computed separately. Off-street parking facilities for one use shall not be considered as providing required parking facilities for any other use, except as hereinafter specified for cooperative use.

E. Cooperative Parking. Cooperative parking between two or more adjoining property owners is allowed; provided, the code official, with approval from the design commission and city engineer, may reduce the total required spaces by 25 percent of the total combined required spaces when the applicant has demonstrated that no adverse impact will occur due to the reduced number of stalls.

F. 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. (Ord. 14C-06 § 4; Ord. 99C-13 § 1).