An applicant for a garage license shall pay to the clerk a license fee based on the floor area of each garage. In a county other than Baltimore City or Baltimore County, the license fee is: $20 for a garage with not more than 2,000 square feet; $40 for a garage with more than 2,000 and not more than 3,000 square feet; $75 for a garage with more than 3,000 and not more than 5,000 square feet; $125 for a garage with more than 5,000 and not more than 7,500 square feet; $200 for a garage with more than 7,500 and not more than 10,000 square feet; or $200 for a garage with more than 10,000 square feet plus $50 for each additional 5,000 square feet or part of 5,000 square feet. In Baltimore City or Baltimore County, the license fee is $6 for each 100 square feet of each garage. The floor area on which the license fee is based is the total floor area of all floors of the garage, excluding: the space occupied by a machine shop that is defined by permanent partitions; and the floor area of a space 15 feet wide and extending the entire length or depth of the garage on each floor on which a law requires that a space be kept open.