A. Permitted uses are as follows:

(1) All uses permitted in residential districts.

(2) Office-type trailer or mobile home used as business quarters for thirty (30) days or fewer.

(3) Dwelling on the premises for a night watchman or janitor.

(4) Cafeteria on the premises for use by employees and not for the general public.

B. Uses permitted by special permit are as follows:

(1) Accessory apartment.

(2) Boat livery, cemetery, children's camp, golf course, private nonprofit membership club, public utility, riding stable, ski tow.

(3) Hospital, nursing home, home for the aged.

(4) Private school, nursery or Kindergarten,

(5) Veterinarian, animal hospital, dog kennel.

(6) Conversion of a one-family dwelling, in existence for two (2) years or longer, to a two-family dwelling, on a lot with a minimum of fifteen thousand (15,000) square feet.

(7) Mobile home or travel trailer used as a dwelling or business quarters for more than thirty (30) days in a year.

(8) Multifamily housing for the elderly, owned by a public or a nonprofit community housing organization.

(9) Other multifamily dwellings, if within a major residential development. (Note: Special permit from the Planning Board.)

(10) Major residential development. (Note: Special permit from the Planning Board.)

(11) Private garage or parking for more than three (3) cars or more than one (1) truck or other commercial vehicle.

(12) Scientific research and development, including manufacturing, instruction and other activities clearly incidental thereto, at the maximum density of three (3) employees per acre of lot and with direct access to an arterial street, as defined by the Town of Southborough Planning Board.

C. Prohibited uses. All uses which are not listed above, legally nonconforming or otherwise allowable by the provisions of the zoning regulations are prohibited.

D. Development standards are as follows:

(1) Minimum lot area: fifty (50) acres; minimum twenty thousand (20,000) square feet exclusive of wetlands.

(2) Minimum frontage: five hundred (500) feet.

(3) Minimum setbacks:

(a) Front: one hundred fifty (150) feet.

(b) Rear: two hundred (200) feet.

(c) Other street: two hundred (200) feet.

(4) Maximum height: thirty-five (35) feet, three (3) stories.

(5) Maximum floor area ratio: forty-hundredths (.40).

(6) Residential dwellings. Residential dwellings in the SP District must comply with the standards of the RA District.