1. Cornices, canopies, eaves or other architectural features may project a distance not exceeding four feet into any front or rear yard and 40 percent into any side yard to a maximum of four feet. In the case of a side yard which is less than five feet, a two-foot projection is permitted; provided, that such projection does not extend closer than one foot to the property line;

2. Fire escapes may project a distance not exceeding four feet, six inches;

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

4. Bay windows, balconies 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; except, that in the R-3 and C-O zones bay windows, stairways and balconies may not project into any required side or rear yard abutting an R-E, R-1 or R-2 zone;

5. An open, unenclosed stairway not covered by a roof or canopy may extend or project into a required rear or side yard not more than three feet, except as provided in subsection (A)(4) of this section.