A. Paved terraces may project into required front, side or rear yards; provided, that no structures placed there violate other requirements of this title;

B. Unroofed landings and stairs may project into required rear yards only;

C. Cornices, eaves and similar incidental architectural features may project not more than two feet into any required yard;

D. An accessory building not exceeding 14 feet in height may be permitted to occupy a rear yard; provided, that no more than one-third of the total area of such rear yard shall be so occupied;

E. Every building erected after January 17, 1978, shall be located on a lot as defined in PMC 17.08.255;

F. In residential districts, an enclosed porch or arctic entry, including their roofs, may project into a required front or rear yard not more than five feet if the enclosed porch or arctic entry is no larger than 35 square feet of gross floor area and there is no other practicable location for such an entrance on the structure. This provision is restricted to dwellings constructed before January 1, 1986;

G. In residential districts, the installation of handicapped accessible ramps with handrails in any required setback: