Gasoline pumps and/or the sale of gasoline shall be permitted, provided that the pump for the retail selling of gasoline on any lot is located a minimum of 2,500 feet from any other lot, in Town, where the retail sales of gasoline occurs, regardless of the district in which such other lot may be located. The 2,500 feet shall be the straight horizontal distance from the property line of the lot where gasoline sales is proposed to the property line of any lot where gasoline sales exists.