Owners of apartments in the evacuated Mascot Towers building in Sydney are planning to sleep on the street to protest a damages bill of at least $76,000 per unit to fix defects, as questions continue on who will ultimately have to pay.

The owners face a $10 million bill – half the initial building cost of $22 million – to fix cracks in the building's primary support structure, according to the notice for an owners meeting to be held on August 22.