Only the following accessory uses customarily incidental to uses permitted in this district shall be permitted:
(a) Off-street parking and loading facilities as permitted and as regulated in Chapter 1129.
(b) Signs as permitted and as regulated in Chapter 1133.
(c) Maintenance and storage facilities either within wholly enclosed buildings or suitably screened by a fence or dense landscaping so that no stored material is visible from an abutting street or lot.
(d) Lunch rooms and recreation facilities for the exclusive use of employees.