This regulation establishes the process for determining if a lot slopes sufficiently to allow additional stories on the downhill side of a building erected on a sloping lot. This regulation applies to any lot that is determined to slope sufficiently to allow additional stories in excess of the number of stories allowed in the zone as defined in 59-A-5.41 of the Zoning Ordinance. It is the policy of the Department of Permitting Services to determine a lot to be sloping when any of the following circumstances occur on the lot: (1) There is a change in vertical elevation of at least one (1) foot for each twelve (12) feet of horizontal distance when measured from pre-development grade between any of the following points: (a) from front lot line to rear of building or addition; (b) from rear lot line to front of building or addition; (c) from front building restriction line to rear building restriction line; (d) from rear building restriction line to front building restriction line; (e) from front of building or addition to rear of building or addition; (f) from rear of building or addition to front of building or addition; (g) between side building restriction lines; or (h) from one side of building or addition to other side of building or addition, and (2) Between the points selected, there is a change in elevation of at least six feet.