In October 1994, the buildings were permanently listed on the Western Australian State Heritage Register.

[2][3] In 1896 Fremantle rate books record that vacant lot 49, 30 Mouat St, was brought by Drummond and Strelitz.

[1] Paul Strelitz arrived in Melbourne in 1886, but, following the reports of gold discovery, moved to Western Australia in 1894.

Allen also designed other buildings for the Strelitz brothers, in Hay, Murray and William Streets Perth.

Tenants in the offices included the architect firm of Cavanagh and Keogh who designed a number of buildings in Fremantle.