The last resident of Sydney's controversial Sirius building has been described as "the glue that held her community together" at a farewell morning tea.
Myra Demetriou, 91, became the face of the campaign to save the brutalist Rocks building after the NSW government refused to place it on the State Heritage Register in July 2016.
She was honoured with a morning tea at the building's entrance on Saturday, where supporters of the Save Our Sirius lobby group vowed to keep fighting to save it.
The government is selling the site, which was purpose-built for social housing in the 1980s, to developers who plan to replace it with hundreds of private apartments.
"I have met tenants who have already moved into their new homes across NSW and seen firsthand how this decision has improved the lives of our most vulnerable," Housing Minister Pru Goward said.
Federal Labor MP Tanya Plibersek was among those to condemn the "heartless" decision to move residents, saying it would transform Sydney into a more homogenous, less diverse place.
"Myra is the sort of person that makes a suburb turn into a community," she told the crowd on Saturday.
Ms Demetriou, who is legally blind, has lived in the area since 1959 and has been in the Sirius building for a decade.
Guests paid tribute to her tenacity and generosity and said she was always willing to help neighbours.
Sydney Lord Mayor Clover Moore lashed out at the government's "ideologically-driven" decision to offload the iconic building.
"Sirius will continue to be a symbol of the state government's shocking inaction on providing affordable housing," she said.
"From every point of view - social, environmental, heritage and community - what is happening here is wrong."
Sydney MP Alex Greenwich vowed the campaign to save the building would continue beyond the next state election in 2019.
"What it represents is too important to Sydney to ever let go of this campaign," he said.
Mr Greenwich also revealed Ms Demetriou would become the 2018 Sydney electorate woman of the year.
"It is women like Myra that make the city so great and so strong," he said.
The building was put on the market for about $100 million in December and the Save Our Sirius group has registered an interest to buy it.
Property Minister Victor Dominello said the government welcomed any bidders but would not rush into a decision.
"It is the government's clear preference to return the skyline to Sydney ... we encourage responses from across the market including SOS," he said.