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Draft Chapter 18.28 Tukwila Urban Center (TUC) District <br />a. Provide paved pedestrian areas along the back -of- sidewalk, such as plazas or courtyards, that <br />enhance /enlarge the public frontage. <br />b. Only permitted on parcels where the public frontage improvements meet the corridor <br />standards in this code. <br />c. Must meet applicable pedestrian space design requirements, 18.28.250.E. <br />2. Streetscape <br />a. Cover front yards with landscaped, pervious surfaces that visually soften and enhance the built <br />environment. <br />b. Provide pathways connecting the public sidewalk to the front door and to any parking areas. <br />c. 1 tree per 500 square feet of landscaped setback area or 1 tree per 20 to 30 linear feet of <br />frontage (depending on tree species and location of underground or at- ground utilities and <br />excluding curb cuts) whichever results in more trees. <br />d. Where there are existing street trees the additional trees required by this section shall be <br />planted behind the sidewalk in an informal pattern and consist of a mix of deciduous and <br />evergreens. <br />e. 1 shrub per 4 linear feet of frontage, excluding curb cuts, or a planted berm at least 24 inches <br />high. <br />f. Sufficient live groundcovers of varying heights, colors and textures to cover, within 3 years, <br />100% of the landscape area not needed for trees and shrubs. Groundcover must be planted <br />with a minimum spacing of 12- inches on center for 4 -inch pots and 18- inches on center for 1 <br />gallon pots. If grass is being used as the groundcover, a 3 -foot diameter ring of bark mulch is <br />required around each tree. <br />3. When there is an existing sidewalk that does not meet the Corridor standard for public frontage <br />and the sidewalk remains in place, the required front yard landscaping width shall be measured <br />from the back of sidewalk or edge of right -of -way, whichever is further from the road centerline. <br />4. When public frontage is constructed to meet the Corridor standard, the front yard landscaping <br />requirement shall be waived. To qualify for the waiver, public frontage improvements must be <br />made along the entire street fronting the parcel. Public frontage improvements may continue into <br />a courtyard or plaza. <br />B. Side and Rear Yard Landscape Types <br />1. Groundcover <br />a. This is appropriate where the adjacent uses are compatible and no screening is necessary. <br />W: \Long Range Projects \Southcenter Plan \Plan 2011 \Book 2 \FINAL PC BOOK26.12.12with markups.dou Page 49 6/21/2012 <br />53 <br />