The regulations and development standards set forth in this chapter shall be applicable to each use of property within the city, except as expressly otherwise provided herein.

In any C or M zone, notwithstanding the regulations of this title relating to the height of buildings and structures, mechanical equipment and roof structures may be erected in excess of the prescribed height limitation, provided that such equipment is screened from view. Fire or parapet walls, skylights, microwave towers, flagpoles, chimneys, smokestacks, wireless masts and similar structures, mechanical equipment and roof structures may be erected in excess of the prescribed height limitation.

Except as expressly provided herein, every required yard shall be open and unobstructed from the ground to the sky. No yard or open space provided around one building for the purpose of complying with the provisions of this title shall be considered as providing a yard or open space for any other building, nor shall any yard or open space on one lot be considered as providing a required yard or open space for another lot.

When the common boundary line separating two contiguous lots is covered by a building or permitted group of buildings, such lots shall be deemed to be a single lot and the yard area requirements of this title shall apply accordingly.

The owners of each corner lot and each reverse corner lot in any R zone, shall maintain, for safety vision purposes, a triangular area within which no building, structure, tree, fence, shrub, nor other visual obstruction higher than 42 inches above the established grade of the lot shall be permitted or maintained. One angle of such triangular area shall be formed by the front and side lot lines separating the lot from the streets, and the sides of such triangle forming the corner angle shall each be 15 feet in length, measured from the aforementioned angle. The third side of the triangle shall be a straight line connecting the last two mentioned points which are distant 15 feet from the intersection of the front and side lot lines.

The depth of the required front yard in lots facing directly upon the arc of the cul-de-sac shall be measured on an arc parallel to the front property line comprising the arc of the cul-de-sac and being a distance therefrom of the required front yard depth as prescribed for each zone.

The commission shall determine, with regard to through lots, which line of the lot shall be the front lot line.

The provision of this title shall not prohibit the erection of any fence or wall as required by any law or regulation of the State of California or any agency thereof.

Any person who plans on developing a site of four acres or more shall be required to request the adoption of a specific plan by the city pursuant to the authority and procedure set forth in California Government Code Section 65450 et seq. Any person who plans on developing a site of four acres or more and who requests the preparation of a specific plan shall deposit with the city an amount equal to the estimated cost of preparing the specific plan prior to the preparation of the specific plan by the city.