Variances from the regulations of this chapter shall be granted by the Board only in accordance with the standards established in § 15.06 of this chapter and may be granted only in the following instances and in no others:
(A) To permit any yard or setback line of less dimension than required by the applicable regulations;
(B) To permit any building or structure to exceed the height limitations imposed by the applicable regulations;
(C) To permit the use of a lot or lots for a use otherwise prohibited solely because of the insufficient area or width of the lot or lots, but in no event shall the respective area and width of the lot or lots be less than 70% of the required area and width;
(D) To permit the same off-street parking facility to qualify as required facilities for two or more uses provided that substantial use of such facility by each use does not take place at approximately the same hours of the same days of the week;
(E) To reduce the parking and loading requirements in any of the districts whenever the character or use of a building is such as to make unnecessary the full provision of parking or loading facilities, or where such regulations would impose an unreasonable hardship upon the use of the lot, as contrasted with merely being granted for a convenience;
(F) To permit the alteration or enlargement of an existing building or use located on premises in a district which prohibits that use of land or building, or the height and area of buildings existing at the time of the adopting of this chapter where such alteration or enlargement is a necessary incident to the use of the structure existing at the time of the adoption, amendment or change of this chapter; and
(G) To permit the reconstruction of a nonconforming building which has been damaged by explosion, fire, act of God or the public enemy to the extent of more than 65% of its market value, as determined by the Board, where the Board finds some compelling public necessity requiring a continuance of the nonconforming use.