Only the following accessory uses customarily incidental to uses permitted in this district shall be permitted:
(a) Playfield or recreational facility in conjunction with a permitted principal use.
(b) Dormitory, in conjunction with a permitted principal use.
(c) Offices of staff doctors.
(d) Off-street parking and loading facilities as permitted and regulated in Chapter 1129.
(e) Signs as permitted and regulated in Chapter 1133.