Minimum lot area and lot width requirements shall not apply to lots of record as of the effective date of this Chapter (see Section 405.040 Definition for "Lot of record").

No basement or cellar shall be occupied for residential purposes until the remainder of the building has been substantially completed.

Where a lot or tract is used for farming or for a commercial or industrial purpose, more than one (1) main building may be located upon the lot or tract, but only when such buildings conform to all open space requirements around the lot for the district in which the lot or tract is located.

In the event that a lot is to be occupied by a group of two (2) or more related buildings to be used for multiple dwelling, educational, institutional, motel or hotel purposes, there may be more than one (1) main building on the lot; provided however, that the open spaces between buildings that are parallel or within forty-five degrees (45°) of being parallel shall have a minimum dimension of twenty (20) feet for one-story buildings, thirty (30) feet for two-story buildings and forty (40) feet for three- or four-story buildings.

Where an open space is more than fifty percent (50%) surrounded by a building, the minimum width of the open space shall be at least twenty (20) feet for one-story buildings, thirty (30) feet for two-story buildings and forty (40) feet for three- and four-story buildings.

Every part of a required yard shall be open to the sky, unobstructed except as follows:

Open or lattice-enclosed fire escapes, required by law, projecting into a yard not to exceed five (5) feet and the ordinary projection of chimneys and plasters shall be permitted by the Building Inspector when placed so as not to obstruct light and ventilation.

In any residential district, no fence, structure or planting shall be maintained within thirty (30) feet of any street intersection.

Where lots have double frontage, the required front yard shall be provided on both streets.

An open, unenclosed porch, balcony or paved terrace may project into a front yard for a distance not to exceed ten (10) feet. An unenclosed vestibule containing not more than forty (40) square feet may project into a front yard for a distance not to exceed four (4) feet.

The front yards heretofore established shall be adjusted in the following cases:

The required side yard on the street side of a corner lot shall be the same as the required front yard on such street, except that the building width shall not be reduced to less than thirty-two (32) feet and no accessory building shall project beyond the required front yard on either street.

For the purpose of the side yard regulations, a two-family dwelling or a multiple-family dwelling shall be considered as one (1) building occupying one (1) lot.

Commercial or industrial buildings used in part for dwelling purposes shall provide side yards not less than five (5) feet in width unless every dwelling room opens directly upon a front yard, rear yard or court.

Terraces, uncovered porches, platforms and ornamental features which do not extend more than three (3) feet above the floor level of the ground (first) story may project into a required yard; provided, that these projections be distant at least two (2) feet from the adjacent side lot line.

Whenever a lot of record at the effective date of this Chapter has a width of less than fifty (50) feet, the side yards may be reduced to a width of not less than ten percent (10%) of the width of the lot, but in no instance shall it be less than three (3) feet.

Open-lattice enclosed fire escapes, fire-proof outside stairways and balconies opening upon fire towers and the ordinary projections of chimneys and flues into the rear yard may be permitted for a distance of not more than three and one-half (3½) feet and where the same are so placed as not to obstruct light and ventilation.

Where a lot abuts upon an alley, one-half (½) the alley width may be considered as part of the required rear yard.

No accessory buildings shall be constructed upon a lot until the construction of the main building has been actually commenced and no accessory building shall be used unless the main building on a lot is completed and used. Also, no accessory building shall be used for dwelling purposes, other than by domestic servants employed entirely on the premises.

Accessory buildings may be built in a required rear yard but such accessory buildings shall not occupy more than thirty percent (30%) of a required rear yard and shall not be nearer than five (5) feet to any side or rear lot line, except that when a garage is entered from an alley, it shall not be located closer than ten (10) feet to the alley line. If a garage is located closer than ten (10) feet to the main building, the garage shall be regarded as part of the main building for the purposes of determining side and rear yards.

Public, semi-public or public-service buildings, hospitals, institutions or schools, when permitted in a district, may be erected to a height not exceeding sixty (60) feet if the building is set back from each yard line at least one (1) foot for each two (2) feet of additional building height above the height limit otherwise provided in the district in which the building is located.

Chimneys, cooling towers, elevator bulkheads, fire towers, monuments, smokestacks, stage towers or scenery lofts, tanks, water towers, ornamental towers and spires, radio and television towers, antennae or aerials, conveyors, flagpoles, grain elevators or necessary mechanical appurtenances are exempt from the height regulations as contained herein.

Buildings that are to be used for storage purposes only may exceed the maximum number of stories that are permitted in the district in which they are located, but such buildings shall not exceed the number of feet of building height permitted in such district.