In any research laboratory and office district, no building or premises shall be used, and no building, group of buildings or part of a building shall be erected, enlarged, altered, arranged or designed to be used, in whole or in part, except for one or more of the following uses:

No use permitted hereunder shall be so conducted as to cause a harmful discharge of waste materials into the ground, water or atmosphere or which constitutes a menace to persons, surrounding properties or plant growth by reason of fire, explosion or other physical hazard.

No building shall be located at a distance less than 150 feet from the street on which such building fronts, except that gatehouses, bus stop shelters and security offices one story in height may be located a distance not less than 25 feet from the street. No building shall be located at a distance less than 300 feet from all other boundaries of the lot, except that where a laboratory and/or office building exists or is subsequently erected on a contiguous lot, such distance may be reduced to not less than 100 feet on each side where such lots adjoin.

All buildings on any lot shall not cover in the aggregate a total of more than 10% of the lot area, and no building shall exceed three stories or 45 feet in height, and the third story shall not exceed in area 35% of the entire ground floor area of the building. If the space of any building is partly below grade, for the purposes of this article, it shall not be considered a story if more than 1/2 of the total space is located below the adjoining minimum finished grade. The height limitations of this article shall apply to chimneys for central heating and power plants, but shall not apply to ventilators, skylights, water tanks, bulkheads, building chimneys, air-conditioning equipment, necessary mechanical appurtenances and similar features not used for human occupancy and usually extended above the roof level, except that the total area covered by all such features shall not exceed 25% of the roof area, and the height of any such feature shall not be more than 15 feet above the roof level.

One antenna mast and one water tower per lot, when accessory to the principal use, may be erected to a height not to exceed 100 feet above the ground by permission of the Planning Board after due notice and public hearing. The Planning Board may permit additional temporary antenna masts in proper cases when, in the judgment of the Planning Board, such masts are required or desirable in connection with or accessory to permitted uses in the district. Such additional masts shall not exceed 100 feet in height and shall be permitted to stand for a period not to exceed one year, after which time they shall be dismantled. The applicant for such permit shall deposit the sum of $500 with the Town Clerk to ensure the removal of said masts upon the expiration of the time period set forth in said permit. In granting such permission, the Planning Board shall find, upon satisfactory proof, that such antenna or water tower will not constitute a physical hazard or be detrimental to the value of adjacent properties, that the location, size and character of such antenna or water tower will be in harmony with the appropriate and orderly development of the district in which it is situated and will not be detrimental to the orderly development of adjacent districts and that the granting of such permission will be in harmony with the general purposes set forth in Article I of this chapter.

Access and service drives shall be laid out in such a manner that connections with the street or streets on which the lot has frontage are located and designed so as to avoid unsafe conditions or traffic congestion.

Parking space shall be provided on the lot to accommodate company, employee and visitor motor vehicles, with at least two car spaces for each three employees on duty at the peak employment period and one space for each company vehicle for which the buildings on the lot are designed. No parking area for commercial-type vehicles shall be located within 100 feet of all other property lines. Parking areas shall be permanently improved and suitably screened with planting and shall be set back from all lot boundaries at least 50 feet, except that in passing on a plan of development, the Planning Board may approve a lesser distance between parking areas of adjoining laboratory and/or office building developments.