Following the state government's 2014 decision to sell the site and invest the proceeds into social housing elsewhere,Ms Demetriou has featured prominently to the campaign to allow Sirius residents to remain.
Shaun Carter,chairman for the Save Our Sirius Foundation,introduced her at the Saturday meeting as"the face of our campaign,the voice of our campaign".
A crowd crammed into the small courtyard outside the Sirius building to hear speakers including Labor MP Tanya Plibersek,City of Sydney lord mayor Clover Moore,Independent Sydney MP Alex Greenwich and City of Sydney councillors Philip Thalis and Linda Scott.
Each thanked Myra for her place at the heart of the Millers Point community. They also expressed admiration for the building's brutalist architecture values and their support for affordable housing in central Sydney.
"Myra is the sort of person that makes a suburb into a community,"Ms Plibersek said.
"She has been a helping hand to her neighbour,the first person to volunteer to cook them a meal,to bake scones for the charity drive,to do whatever she can to make this community a community - not just a bunch of people living in a suburb together."