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E <br /> Spacing requirements for buildings or Portions os of <br /> buildings containing dwelling or lodging ti <br /> shall be based on horizontal length of walls, number <br /> of stories, type of windows in walls involved, and <br /> orientation of main exterior entrance to individual <br /> units. Distance between walls shall be at least <br /> the sum of the depths the open spaces required for <br /> each. ' <br /> d) where portions of buildings contain different <br /> numbers of stories. <br /> Where portions of buildings contain different numbers <br /> of stories, required clearance from lot or building <br /> site lines shall be as established for the portion <br /> nearest to the lot or building site line except where <br /> spacing required for portion further from the line is <br /> of greater depth in which case the depth so established <br /> is the required clearance from the line (as projected) <br /> vertically when space is provided other than at ground <br /> level) . Lower portions of buildings may extend into <br /> clearance distances required for upper portions if <br /> roof areas are appropriately improved in relation to <br /> views from the same or higher levels but shall provide <br /> clearance to meet their own requirements. <br /> The drhwing illustrates these relationships (Figure 2). <br /> At the left of the building the lot or building site <br /> line would be at or beyond the point at which the <br /> diagonal at A reaches the ground since the portion of <br /> the building to which it relates requires greater spacing <br /> than does C and would therefore determine the require- <br /> ment. <br /> e) Length of walls. <br /> Length of walls shall be measured as the horizontal <br /> distance from corner to corner. Where walls in <br /> continuous general frontage (as in the case of attached <br /> dwellings) are offset by angles or setbacks of six <br /> feet or more, length of each segment so set off shall <br /> be measured separately in establishing pertinent <br /> depth. Where walls in continuous general frontage <br /> enclose portion of buildings varying one story or more <br /> in height, as in Figure 2, the length of each segment <br /> so varying shall be measured separately in computing <br /> pertinent yard depth. Length of. the wall of a circular <br /> building shall be construed as the diameter of the build- <br /> ing. <br /> Figure 2. , A C <br /> , <br /> 6-10 <br /> E <br />