No structure shall hereafter be built or moved and no structure or land shall hereafter be used, occupied or designed for use or occupancy unless the minimum off-street parking and off-street loading spaces are provided as required by Section 167.04. No structure or use already established on the effective date of these regulations shall be enlarged unless the minimum off-street parking and loading spaces which would be required by Section 167.04 are provided for the whole structure or use as enlarged.