[3][4] The council subsequently established two small offices on the north side of King Edward's Street.

[5] In due course more substantial facilities became necessary and a red brick building on Duke Street (later known as Block D), designed by Frank Whitmore in the classical style, was completed in 1909.

[1][6] The design involved an asymmetrical main frontage with four bays facing Duke Street; the left bay featured an arched recess containing a doorway with a fanlight above flanked by Doric order columns and full height stone pilasters bearing the county coat of arms; there was a double window on the first floor and a triple window on the second floor with an open pediment above.

[1] The Duke Street block was designed with a view to it being later extended to incorporate a council chamber, but in 1913 the council decided not to pursue the extension on grounds of cost, preferring to continue to meet at both Shire Hall and in London.

[10][12] Works of art in the building include a bust of the politician, Thomas Gardiner Bramston, by the sculptor, John Ternouth[13] and a bust of the politician, John Perry-Watlington, by the sculptor, William Theed.