After the effective date of this chapter, off-street parking spaces shall be provided as hereinafter specified at the time a building or structure is erected or at the time a new use of open land is established. In the case of an enlargement of any existing building, structure or use after the effective date of this chapter, off-street parking spaces shall be provided as hereinafter specified for the enlarged portion of such building, structure or use.
A.
No existing off-street parking area shall be reduced in capacity so as to be less than required by this chapter, or, if such parking capacity is already less than herein required, such parking area shall not be further reduced; provided, however, that a reduction in such existing parking area shall be allowed if equivalent parking space is provided for the use involved.
B.
In the case of change of use which would result in requirement for a greater parking area than is provided, the Zoning Board of Appeals shall determine the number of additional spaces to be required.