Changes in Use. Whenever a building or use (including these specified in § 602, Subsection 1) is changed or enlarged in floor area, number of employees, number of dwellings, seating capacity or otherwise to create a need, based upon the requirements of § 601, for an increase of 10% or more in the number of existing parking spaces, the number of additional spaces to be provided shall be based upon the incremental change or enlargement so required.