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DESIGN PALETTE • Size in relation to the size of the building. ,� Diameter(D) • Adjacent building character. For instance, if the adjacent buildings are historic, you might want to select lacy trees to preserve the view of the facades (e.g., Rockefeller Avenue). • Space availability within the sidewalk. In general, the diameter i' of the mature tree's crown should not exceed twice the aidis sidewalk width minus 7 feet. (See Figure 27.) Tree Species Selection Effective street tree selection depends on a number of factors, including matching horticultural needs to environmental conditions, available space, the presence of overhead wires and underground utilities, nursery stock availability, and desired 'F'-'r 3'yr—=. characteristics: size, shape, quality of shade, hardiness, growth — Sidewalk(X) rate, and foliage, bark, and blossom characteristics. Street tree selection, especially for large plantings of uniform trees, should Tree Diameter(D)=2(X-3 1") be carefully considered after a thorough study of local conditions Figure 27. Tree diameter and project objectives. The selection should be made during calculation. the street design process, since the type of tree(s) selected can have a great impact on overall street design. In this plan, the exact tree species, spacing, and qualities are not specified for a number of streets. This allows the designers and public participants of a project to consider a variety of options during the design process. However, the desired characteristics for street trees on each street are specified in Chapter 4, Street Designs, and the chart in this chapter describes characteristics of each species. From these two sets of information, a preferred species for each street may be selected. Street trees are a proven way to upgrade a street's appearance, increase pedestrian activity, and encourage redevelopment. Therefore, this plan recommends street landscaping as a major street improvement element. The recommended improvements, fixtures, and lights have all been selected to be background elements in that they do not call attention to themselves and are intended to visually unify the downtown rather than add variety and unique interest. Therefore, it is the trees and landscaping that will be most effective (and cost effective) at providing individual streets with special character, enhancing building facades, softening the pedestrian environment, and, in general, transforming the downtown's visual character. To visually transform the downtown in a short period of time and within a modest budget, the plan recommends a street tree planting program where plantings of trees are installed on selected streets in advance of longer term comprehensive street reconstruction. For example, if two or more property owners are redeveloping their properties on a given street, it might be most cost effective to install the trees on the whole street so that: • Tree spacing can be established to accommodate future lights, utilities, etc. • The full planting of trees can be established and maintained effectively. • The trees make a strong visual impact. Everett Downtown Streetscape Plan