Notwithstanding the provisions of Sections 81-271 to 81-274, inclusive, relating to Alternate Height and Setback Regulations-Daylight Evaluation, the provisions of this Section shall apply under special conditions, as follows:

(a)        For zoning lots with street frontages exceeding 250 feet

(1)        Where the length of the street frontage is more than 250 feet but not more than 500 feet, the building as viewed from each vantage point shall be plotted on a daylight evaluation chart that extends in both directions from the 90 degree line on the horizontal axis. In each case, the number of available daylight squares for daylight evaluation shall be the number of squares between the far lot line and the near lot line.

(2)        Where the length of the street frontage is more than 500 feet, daylight evaluations shall be made from three vantage points, as follows: vantage points one and two, each 250 feet distant from a far lot line extended to the center line of the street, and vantage point three, on the center line of the street, half-way between the other two vantage points. The daylight evaluation charts for the first two vantage points shall in each case encompass a view extending from the far lot line to the 90 degree line on the horizontal axis and the number of available daylight squares shall be the number of squares between the far lot line and the 90 degree line and above the curved line representing an elevation angle of 70 degrees. The daylight evaluation chart for the third vantage point shall extend in both directions from the 90 degree line on the horizontal axis to the vertical lines representing the points on the front lot line directly opposite vantage points one and two. The number of available daylight squares for daylight evaluation shall be the number of daylight squares between such vertical lines and above the curved line representing an elevation angle of 70 degrees.

(b)        For zoning lots with interrupted street frontages

Where a zoning lot has two or more front lot lines on the same street which are separated by frontage of an intervening zoning lot, there shall be two daylight evaluations for each such front lot line. Each lot line of the zoning lot that intersects the street line shall be treated as a far lot line for the purposes of daylight evaluation from a vantage point.

(c)        Where front lot lines are curved or broken

If the front lot line of the zoning lot is curved or bent, the extremities of such front lot line shall be connected by a straight line, which shall be considered the front lot line.