Appurtenant structures. Church spire, belfry, cupola, dome, monument, smokestack, derrick, conveyor, flag pole, radio tower, television tower, mast, antenna, aerial, roof tank, ventilating air conditioning and similar building aerial, roof tank, ventilating air conditioning and similar building service equipment; roof structure, chimney and/or parapet wall; provided, any such structure shall set back from the vertical plane of the permitted building line one foot horizontally for each two feet of height which exceeds the maximum height permitted in the zoning district in which it is located.

Existing designed structures. The vertical extension of a structure existing at the effective date of this chapter may be erected to such height as the original drawings of said building indicated; provided, the building was actually designed and constructed to carry the additional stories necessary for such height.

Determination of yards and minimum distance to lot lines on irregularly shaped lots. When any main wall of a structure does not parallel the lot line which the wall faces, the yard or minimum distance to the lot line, from any given point along the face of the wall, shall be equal to the minimum dimension required for that yard or distance to lot line, whichever is applicable.

Planned commercial or industrial building groups. Under controlled conditions, more than one principal structure may be permitted on a lot and required area regulations and yard requirements may be waived.

Projections into and occupancy of yards, courts or other open spaces. The following projections into and the occupancy of required yards, courts, or other open spaces, except a porch, deck and/or similar attached or semidetached accessory structure, shall be permitted, subject to the following provisions:

Fences. Except as provided in the next subsection, the yard requirements of this chapter shall not be deemed to prohibit any otherwise lawful fence or wall, provided that in any district, no fence or wall shall exceed six feet in height and meet the front yard setback requirements. However, open fences not exceeding two feet in height are permitted in the front yard. Fences are permitted to be on the property line or at least two feet off the property line. All fences require a permit before installation, and the property must have been surveyed before obtaining said permit.

Visibility at intersections. On a corner lot in any district, no structure, sign, fence, wall, hedge or other planting shall be erected, placed or maintained at a height of more than 30 inches above the curbline within the triangle formed by the street lines and a straight line joining said street lines at points which are 30 feet distant from the point of intersection.

Use of yards for driveways and parking.

Specific areas affected. Suitable screening as defined below shall be installed where any permitted nonresidential use in any district abuts a residential use.

Suitable screening defined. Suitable screening shall be either a thick hedge, or a solid fence or wall four feet to six feet in height.