(a) It is the intent and purpose of this article to recognize and provide for certain types of restricted occupational uses to be carried out within a dwelling located in a residential district. Only such uses will be allowed which:
(1) Are clearly secondary to the use of the premises as a residence;
(2) Are compatible with the residential uses within the neighborhood;
(3) Are limited in extent; and
(4) Do not detract from the residential character of the neighborhood.
(b) Sign applicants are reminded that off-premise signs are deemed principal uses, not accessory uses.