For the purpose of determining required reservoir spaces, fractions equal to or greater than one-half resulting from the calculations in this Section shall be considered to be one reservoir space. In no event shall the dimensions of any reservoir space be less than 18 feet long and 8 feet, 6 inches wide.

(a)        Attended parking facilities

For attended accessory off-street parking facilities or public parking lots with more than 25 off-street parking spaces, off-street reservoir space at the vehicular entrance shall be provided to accommodate:

(1)        five percent of the total number of parking spaces provided in parking facilities with more than 25 parking spaces and up to 50 parking spaces;

(2)        ten percent of the total number of parking spaces provided in parking facilities with more than 50 parking spaces and up to 100 parking spaces;

(3)        ten parking spaces in parking facilities with more than 100 off-street parking spaces and up to 200 parking spaces; and

(4)        five percent of the total number of parking spaces provided in parking facilities with more than 200 off-street parking spaces. However such number of reservoir spaces need not exceed 50.

(b)        Automated parking facilities

For automated parking facilities, off-street reservoir space at the vehicle entrance shall be provided at the rate set forth in paragraph (a) of this Section.

Each individual parking location where a driver is permitted to leave a vehicle for transfer to a mechanized automobile storage and retrieval unit shall constitute one reservoir space. Additional reservoir spaces may be located where drivers queue to access such locations for vehicle transfer.

In addition, the number of reservoir spaces required pursuant to this Section may be reduced where the Commissioner of Buildings determines that the operational characteristics of such automated parking facility warrant such a reduction.

(c)        Automobile rental establishments

For automobile rental establishments, off-street reservoir space at the vehicle entrance shall be provided at the rate set forth in paragraph (a) of this Section.

(d)        Self-parking facilities

For self-parking accessory off-street parking facilities and public parking lots where entering vehicles are required to stop before a mechanically operated barrier before entering such parking facility, such barrier shall be placed a minimum of 20 feet beyond the street line.