The Dorset Street Flats are one of the earliest attempts to construct a building in New Zealand from load-bearing concrete block. As they were required to use a number of concrete columns within the wall structure, Miles Warren and Lyall Holmes were ultimately unsuccessful in realising double-cavity reinforced concrete block construction in the Dorset Street Flats. However, the Dorset Street Flats were an important transitional building in Holmes' development of this innovative and influential structural system, as subsequent designs were built without the additional columnar support.
http://www.heritage.org.nz/the-list/details/7804