Spaces required. In order to ensure that vehicular traffic is unimpeded and to reduce traffic safety hazards, sufficient off-street space shall be provided for loading and unloading materials and goods related to the operation of the business activities in conjunction with the following uses. For retail, wholesale, industry, warehouse and service business establishments, restaurants and fast-food restaurants, a minimum of one parking space for the first 4,000 square feet of gross floor area or major portion thereof and one additional space for each additional 50,000 square feet of gross floor area or major portion thereof shall be provided.