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(21) Side yards of at least ten (10) feet are required for all principal buildings, except that where the lot width is less than sixty (60) feet, the side yard shall be at least five (5) feet. (22) The Planning and Zoning Board may, in conjunction with any site plan review proceeding as may be required under Section 10.6, require larger side yards if such modified dimensions are warranted by existing conditions and/or the nature and location of existing buildings on abutting lots. (23) The total of the minimum front and side yard setbacks shall be at least thirty (30) feet.