Minimum lot area and lot width requirements shall not apply to lots of record as of the effective date of this Chapter. (See Section 405.020 of this Chapter, definition of "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, 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 width at the narrowest space of twenty (20) feet for one-story buildings, and thirty (30) feet for two-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, and thirty (30) feet for two-story buildings.

Every part of a required yard shall be open to the sky, unobstructed by any structure, except for the projection of sills, belt courses, cornices, and ornaments and features which are not to exceed twelve (12) inches. The twelve-inch limitation shall apply to commercial and industrial property only.

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

An open, unenclosed porch, or paved terrace, may project into a front yard for a distance not exceeding 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 hereto 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.

No side yards are required where dwelling units are erected above commercial or industrial structures.

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

Whenever a lot of record as of the effective date of this Chapter has a width less than that required for the district in which it is located, 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 five (5) feet.

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 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, semipublic, 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, church steeples, cooling towers, elevator bulkheads, fire towers, monuments, stacks, stage towers or scenery lofts, tanks, water towers, ornamental towers, spires, wireless towers, grain elevators, or necessary mechanical appurtenances, are exempt from the height regulations as contained herein.