A. Every part of a required yard or interior court shall be open to the sky unobstructed, except for accessory buildings in a rear yard, and except for the ordinary projections of skylights, sills, belt courses, cornices and ornamental features projecting not to exceed twelve inches. This requirement shall not prevent the construction offences and walls not exceeding eight feet in height, except on that portion of lots within thirty feet of the intersection of two or more streets in which case fences and walls shall not be higher than three feet
B. Open or lattice-enclosed fire escapes, fireproof outside stairways and balconies opening upon fire towers projecting into a rear yard not more than five feet, and the ordinary projections of chimneys and flues may be permitted by the building inspector.
C. An open unenclosed porch or paved terrace may project into required front yard for a distance not exceeding ten feet.
D. For the purpose of the side yard regulations, a two-family or a multiple dwelling shall be considered as one building occupying one lot. (Prior code § 11-3-7 (a) (6-9))