The rear view of Government House, the official residence of the State Governor, shows who built it.
The broad arrow was added to buildings which were convict built. Quite often a rope was also surreptitiously added to the decorated brickwork.
I haven’t spotted a rope on Government House but it is definitely there on the Old Town Hall. Oops. I just did a search for the Perth Town Hall which I was certain I had posted at some time in the past. But I hadn’t! I shall rectify that in about a week. And I shall be sure to mention the rope. 🙂