A professional office for the personal use of a physician, lawyer, dentist or professional practitioner of a character similar to any of the foregoing, but specifically excluding funeral homes, realty offices, insurance offices and similar practitioners which are provided for in the commercial district, provided that the office is located within a residence; and provided, further, that no goods are displayed nor profession identified other than by the display of a sign not to exceed two square feet in area with the name and profession of the person using the office, the sign to be placed in a location approved and permitted by the Borough; and further provided that no space is rented out or devoted to the use of other than the owner or tenant of said premises; and further that no more than one agent and one worker are therein employed and the essential character of the building as a residence is maintained.