Mortlock Brothers Ltd operated from 25 Queen Victoria Street (lot 352). It is now the premises of Retro Moto Co (motorcyles).
References
Thanks to Franc. Koning for the research which produced all of the above.
Freotopia
This page incorporates material from Garry Gillard's Freotopia website, that he started in 2014 and the contents of which he donated to Wikimedia Australia in 2024. The content was originally created on 27 November, 2022 and hosted at freotopia.org/buildings/mortlock.html (it was last updated on 3 April, 2024), and has been edited since it was imported here (see page history). The donated data is also preserved in the Internet Archive's collection.