triangular pediments flanked by Ionic order half columns on the first floor. The principal rooms were the council chamber and a reception room known as the "Octagon room".

As the county council's responsibilities grew, it needed more office space than was available in County Hall. It acquired a former jail (built 1791-1794) immediately south-east of the Sessions Room and County Hall, and converted that to be offices. In 1939 the council built a large neo-Georgian office