The official address and principal office of the commission shall be 18-20 Trinity Street, Hartford, Connecticut 06106. The commission shall provide notice in the Connecticut Law Journal if its official address or principal office is changed, in which case the official address or principal office published in such notice shall be deemed to be the commission’s official address or principal office, as the case may be, until this regulation is amended. Unless otherwise provided, the principal office of the commission shall be open from 8:30 a.m. to 5:00 p.m. each weekday, except Saturdays, Sundays and legal holidays.