(a)   Into any required front yard or required side yard adjoining a side street lot line.

   (b)   Cornices, canopies, eaves or other architectural features may project a distance not exceeding two feet, six inches.

   (c)   Fire escapes may project a distance not exceeding four feet, six inches.

   (d)   An uncovered stair and necessary landings may project a distance not to exceed six feet, provided such stair and landing shall not extend above the entrance floor of the building except for a railing not exceeding three feet in height.

   (e)   Bay windows, balconies, uncovered porches and chimneys may project a distance not exceeding three feet, provided that such features do not occupy, in the aggregate, more than one-third of the length of the building wall on which they are located.

   (f)   Subject to the limitations in Section 11107.02, the above-named features may project into any required side yard adjoining an interior side lot line, a distance not to exceed one-fifth of the required least width of such side yard, but not exceeding three feet in any case.

   (g)   Subject to the limitations in subsection (f) hereof, the features named herein may project into any required rear yards the same distances they are permitted to project into a front yard.

   (a)   If not exceeding at any point four feet in height above the elevation of the surface of the ground at such point, they may be located in any yard.

   (b)   If not exceeding at any point six feet in height above the elevation of the surface of the ground at such point, they may be located in any required rear yard or side yard, provided that on a corner lot, abutting in the rear the side lot line of another lot in an R District, no such fence, wall or hedge within twenty-five feet of the common lot line shall be closer to the side street lot line than the least depth of the front yard required on such other lot fronting the side street.

   (c)   Barbed-wire fences, or fences or walls having wire or metal prongs or spikes or cutting points or edges of any kind whatsoever shall be prohibited.