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Draft Chapter 18.28 Tukwila Urban Center (TUC) District <br />tolerant species are strongly recommended and monoculture plantings are discouraged. Low <br />maintenance cost and low replacement costs are two advantages of planting drought tolerant <br />species in grouped configurations. Low (24 -30 inches) shrubs, perennial or groundcover <br />plantings that provide a superior degree of separation between the sidewalk and street at <br />reduced maintenance costs may be used. <br />Figure 32 Examples of landscaped tree wells <br />2. Design <br />a. Landscaping should provide design continuity between the neighboring properties. <br />b. Tree grates flush to the sidewalk should be used along streets with on- street parking and in <br />high traffic areas, such as a transit stop. <br />c. Shade trees should be planted to shade buildings' east and west facing windows to provide a <br />balance between summer cooling and winter heating through solar gain. <br />d. All landscaped areas should be designed to allow aquifer filtration and minimize stormwater <br />run -off utilizing bio swales, filtration strips, and bio- retention ponds where appropriate. <br />18.28.250 OPEN SPACE REGULATIONS <br />A. This section contains Regulations and Guidelines for the provision, design, and configuration of <br />new open spaces that may be publicly accessible. Open Space Regulations are set forth to <br />ensure that the provision, design, and configuration of new open spaces contribute to the <br />character of and support the type of development desired within each District. Open spaces <br />may consist of pedestrian spaces for commercial uses, and common and private open space for <br />residential uses. <br />ZADCD n Clerk's \PC Laserfiche Packet \5 -24 -12 PC Packet \FINAL PC BOOK2_5.18.12_clean.docx Page 56 5/18/2012 <br />W; <br />