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B. A multiple street frontage lot must designate at least <br />one primary street. A lot may have more than one <br />primary street. The primary street will be determined <br />based on the following criteria: <br />1. The street with the highest street classification; <br />2. The established orientation of the block; <br />3. The street abutting the longest face of the block; <br />4. The street parallel to an alley within the block; <br />and <br />5. The street from which the lot takes its address. <br />C. Setback Encroachments. All buildings and structures <br />must be located at or behind required setbacks, <br />except as listed below. Underground structures <br />covered by the ground may encroach into a required <br />setback. <br />1. Porches, stoops, balconies, galleries, awnings and <br />steps. <br />2. Building eaves, roof overhangs and light shelves <br />may extend up to three (3) feet into the required <br />setback. <br />3. Bay windows, oriels, vestibules and similar <br />features that are less than ten (10) feet wide may <br />extend up to four (4) feet, provided that such <br />extension is at least two (2) feet from the vertical <br />plane of any lot line. <br />4. Chimneys may encroach up to four (4) feet, <br />provided such extension is at least two (2) feet <br />from the vertical plane of any lot line. <br />5. Uncovered fire escapes or stairways may extend <br />into a required side or rear setback, provided that <br />such extension is at least two (2) feet from the <br />vertical plane of any lot line. <br />6. Uncovered and unenclosed patios or in -ground <br />pools may extend into a required side or rear <br />setback, provided that such extension is at least <br />two (2) feet from the vertical plane of any lot line. <br />7. Cornices, belt courses, sills, buttresses or other <br />similar architectural features may project up <br />to one and one-half (1'/2) feet into the required <br />setback. Handicap ramps may project to the <br />extent necessary to perform their proper <br />function. <br />8. Rainwater collection systems or a mechanical <br />equipment, such as HVAC units, small renewable <br />energy systems, and security lighting, associated <br />with residential uses may extend into a required <br />rear or side setbacks. <br />DIVISION 3: BUILDING HEIGHT <br />A. Building Height. Building height is regulated in both <br />number of stories and feet and is measured from the <br />average grade to the mean height level between the <br />eaves and ridge of a gable, hip, mansard, or gambrel <br />roof or to the highest point of roof surface of a flat roof. <br />Pitched Roof Flat Roof <br />Max 6' <br />xapet Wall <br />p of Roof <br />B. Average grade is determined by calculating the <br />average of the highest and lowest elevation along pre - <br />development grade or improved grade (whichever is <br />more restrictive) along the front of the building parallel <br />to the primary street setback. Where mass -grading <br />has been approved by the City, average grade shall be <br />considered the improved grade following such mass <br />grading. <br />WHISPER TEXAS PLANNED DEVELOPMENT DISTRICT Pg. 29 <br />