In C1-1, C1-2, C1-3, C1-4, C2-1, C2-2, C2-3, C2-4, C4-1, C4-2, C4-3, C4-4, C7 outside the expanded Transit Zone, C8-1, C8-2, C8-3, M1-1, M1-2, M1-3, M2-1, M2-2 or M3-1 Districts, the Board of Standards and Appeals may permit the parking or storage of motor vehicles on the roof of a public parking garage with a total of 150 spaces or less and, in all districts, the Board may permit modifications of the applicable provisions of Sections 25-11, 36-11 or 44-11 (General Provisions) so as to permit accessory off-street parking spaces to be located on the roof of a building. As a condition of permitting such roof parking, the Board shall find that the roof parking is so located as not to impair the essential character or the future use or development of adjacent areas.

The Board may prescribe appropriate conditions and safeguards to minimize adverse effects on the character of the surrounding area, including requirements for setback of roof parking areas from lot lines, or for shielding of floodlights.