(a) home occupations are permitted within the confines of any dwelling unit, provided all restrictions of this section are complied with.

(b) The primary use of the building shall remain residential, and the operator of the home occupation shall remain a resident thereof.

(c) No structural additions, enlargements or exterior alterations changing the residential appearance to a business or commercial appearance shall be permitted.

(d) No home occupation shall occupy an area greater than 25 percent of the first floor area of the dwelling unit, exclusive of the area of any open porch or attached garage or similar space not suited or intended for occupancy as living quarters. No rooms which have been constructed as an addition to the residence or any attached garage or porch which has been converted into living quarters shall be considered as floor area until two years after the date of completion thereof.

(e) No additional and separate entrance incongruent with the residential structural design shall be constructed for the purpose of conducting the home occupation.

(f) The home occupation shall be conducted entirely within the dwelling unit used as the residence.

(g) For single-family, duplex or townhouse structures, no display of goods or external evidence of the home occupation shall be permitted other than one nonilluminated nameplate, not exceeding two square feet in area, which may be displayed affixed flat against the exterior surface at a position not more than two feet distant from the main entrance of the dwelling unit concerned. For structures housing multifamily or mixed uses, no external evidence of the home occupation shall be permitted.

(h) No provision for offstreet parking or loading facilities, other than the requirements of the district in which the use is located, shall be permitted. Occupations which generate greater volumes of traffic than would normally be expected in a residential neighborhood are prohibited.

(i) No stock in trade or commodities, other than those prepared, produced or created on the premises by the operator of the home occupation, shall be kept or sold on the premises.

(j) No motor power other than electric motors shall be used in conjunction with a home occupation. The total horsepower of such motors shall not exceed three horsepower or one horsepower for any single motor.

(k) No equipment or process shall be used in a home occupation which creates noise, vibration, glare, fumes or odors, detectable to the normal senses off the lot. No equipment or process shall be used which creates visual or audible interference in any radio or television receiver or causes fluctuation in line voltage outside the dwelling unit. No home occupation shall interfere with the reasonable enjoyment of adjoining or nearby dwelling units or properties.