1.   General.  The requirements and regulations specified elsewhere in this chapter shall be subject to additional requirements, exceptions, modifications, and interpretations contained in this section.

   2.   Height and Size Limits.  Height limitations stipulated elsewhere in this chapter shall not apply in the following situations:

      A.   To church spires, belfries, cupolas and domes, monuments, water towers, fire and hose towers, masts, and aerials; to parapet walls extending not more than four feet above the limiting height of the building.  However, if in the opinion of the Zoning Administrator, such structure would adversely affect adjoining or adjacent properties, such greater height shall not be authorized except by the Board of Adjustment.

      B.   To bulkheads, conveyors, derricks, elevator penthouses, water tanks, monitors and scenery lofts; to monuments, fire towers, hose towers, cooling towers, grain elevators, gas holders or other structures, where the manufacturing process requires a greater height than specified, such may be authorized by the Board of Adjustment.

   3.   Front Yard Exceptions and Modifications.

      A.   Front yard requirements do not apply to bay windows or balconies that do not project more than two feet into the front yard.

      B.   In any district where the average depth of two or more existing front yards on lots within 200 feet of the lot in question and within the same block front is less or greater than the least front yard depth prescribed, front yards may be varied.  The depth of the front yard on such lot shall not be less than the average depth of said existing front yards or the average depth of the two lots immediately adjoining or, in the case of a comer lot, the depth of the front yard on the lot immediately adjoining; provided, however, the depth of the front yard on a lot in any R District shall be at least 10 feet.

      C.   For the purpose of determining lot width, that portion of a flag lot used for ingress and egress shall not be included as a part of the required front yard.

   4.   Side Yard Exceptions and Modifications.

      A.   Along any district boundary line, any abutting side yard on a lot in the less restricted district shall have a least width equal to that required in the more restricted district.  Where a building is proposed for a lot in the M District, and a line of such lot abuts an R District, the side yard in the M District shall be increased by three feet for each foot that the proposed building will exceed the height limit of the said R District.

      B.   On a corner lot the least width of a side yard along the side street lot line shall be equal to the required front yard along the side street.  No part of any accessory building shall be nearer a side street lot line than the least depth on any front yard required along such side street.

      C.   The following projections or structures may be permitted in side yards:

         (1)   Accessory buildings or structures subject to the provisions contained elsewhere in this chapter.

         (2)   Fences or walls not over six feet above the average natural grade except as noted in Section 165.09(15).

         (3)   Fire escapes, three feet from side lot line.  Bays and balconies not more than three feet from the building, provided these projections are entirely within planes drawn from either main corner of the side wall.  The sum of the lengths of such projection shall not exceed one-third of the length of the wall of the main building.

         (4)   Chimneys, flues, belt courses, leaders, sills, pilasters, and lintels, ornamental features, cornices, gutters and the like into or over a required side yard not more than one and one-half feet.

         (5)   Terraces, steps, uncovered porches, stoops or similar features, not higher than the elevation of the ground story of the building and distant three feet from the side lot line.

   5.   Rear Yard Exceptions and Modifications.  The following projections or structures may be permitted in rear yards:

      A.   Accessory buildings or structures subject to the provisions contained elsewhere in this chapter.

      B.   Fences or walls, not over six feet above the average natural grade.

      C.   Fire escapes, not more than six feet, and bays and balconies, not more than three feet.

      D.   Chimneys, flues, belt courses, leaders, sills, pilasters, lintels, ornamental features, cornices, eaves, and the like, into or over a required rear yard not more than one and one-half feet.

      E.   Terraces, steps, uncovered porches, stoops, or similar features not more than 10 feet into a required rear yard, or closer than six feet of an alley or within 10 feet of a rear lot line.

      F.   Swimming pools.