Dublin City Council has agreed to include 550 extra social housing units on the new Poolbeg West site.
The 34-hectare site in the south-east of the city, includes the old Irish Glass Bottle premises.
Under usual rules 10% of of the 3,500 homes to be built on the site must be social housing.
But last night the council managed to increase that number.
In a statement, Councillor Daithi Doolan said: "The vote will ensure that 900 social and affordable homes will now be built as part of the Poolbeg development plan. This is a good outcome, but it could have been much better.
"Sinn Féin proposed a further 100 senior citizens homes, bringing the total to 1,000. Unfortunately the combined votes of Labour, Fine Gael and Fianna Fáil reduced that number to 900."
"We firmly believed that despite the scare tactics of the department and council officials we could have easily delivered the extra 100 homes. It is a wasted opportunity. Sinn Féin will continue to put pressure on the department to fund these senior citizen homes."
Good. Approved #PoolbegSDZ Plan for 3,500 homes, at least 350 units social housing, 550 affordable. Thanks for your thoughts on height!— Ciarán Cuffe (@CiaranCuffe) May 18, 2017
Meanwhile, 80% of housing association tenants are happy with the services they receive.
The data is contained in a new survey launched this morning by The Irish Council for Social Housing, along with Túath Housing and Hail.
Dr Donal McManus is Chief Executive of ICSH, he outlines some their main findings.
He said: "80% of tenants felt they were satisfied with the services provided by non-profit housing associations.
"It was also felt that good quality housing, day-to-day repairs, and upkeep in common areas were some of the key things that tenants of housing associations were higher.
"And one of the key factors was good communication was key to good housing management and four out of five tenants felt that was very strong within housing associations."