A buffer is required on any premises in a business district if abutting
or extending into a residential district when through new construction,
addition, or occupancy change the premises is put to use not allowed
in a residential district. Said buffer shall be located entirely within
the business district along the full length of the district boundary,
and shall have a depth of the lesser of 50 feet or 10% of the distance
between the district boundary and the street line of the lot, except
that at locations where the distance from the district boundary to
the nearest structure in the residential district is not less than
150 feet, the Board of Appeals may grant a special permit to allow
location of part or all of the buffer outside of the business district.