The area of the zoning lot between the street line and all street walls of the building and their prolongations shall be planted at ground level, or in raised planting beds that are permanently affixed to the ground, except that such plantings shall not be required at the entrances to and exits from the building, within driveways accessing off-street parking spaces located within, to the side, or rear of such building, or between non-residential uses, other than philanthropic or non-profit institutions with sleeping accommodations and long-term care facilities, and the street line. No zoning lot shall be altered in any way that will either create a new non-compliance or increase the degree of non-compliance with the provisions of this Section.