The action group wanted to emphasise the units were basic, "means-tested accommodation" which belonged to the ratepayers of Hamilton, Ms Durose said.
The 51 elderly tenants living in the affected units would have to find new homes; for one man in the action group this would be his third forced move.
"These people, most of whom no longer drive, may need to move well away from their social networks, doctors, public transport."
Ms Durose accepted that proposed rent increases by the council were necessary but didn't think the units' elderly residents should be forced to move.
A further 21 housing blocks, home to 344 elderly tenants, were also likely to be sold as part of the council's 10-year plan.
Council management wants to sell the housing portfolio over five years to help repay the city's $30 million debt.
The action group will oppose the council's proposal next week at a meeting about Hamilton's 10-year plan.