Constructed in 1930-1931 as shared headquarters for The Royal Society of NSW, the Institution of Engineers, Australia, and the Linnaean Society of NSW.
<a href="//commons.wikimedia.org/wiki/User:Bjenks" title="User:Bjenks">Bjenks</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>