A new report on ghost estates has found that there are 2,066 unfinished housing developments around Ireland.
Local authorities have developed site resolution plans for 770 developments.
211 of these have already been completed, and a further 523 are currently being resolved.
Housing minister Jan O'Sullivan said that authorities are categorising them and taking action to make them liveable.
Speaking on RTÉ's Morning Ireland, the minister said that they are working through the cases gradually, with a focus on completing estates.
She said in a small number of cases where developments, or part of developments are not viable, they may have to be demolished.
Minister O'Sullivan said safety was being prioritised, with over €3m spent on improving living conditions for residents in 128 developments.
NAMA is funding remedial work in 29 developments now under its ownership, and is examining a further 137 sites.
The Health and Safety Authority is involved on 20 sites to ensure developers are complying with safety legislation.
On the issue of who owns the ghost estates now, the minister said there were many different owners.
"In some cases they have been taken over by NAMA, or part of them have been taken over by NAMA. In some cases there are receivers. In some cases the developers are still active, but maybe not very active. And in some cases the issues have been resolved and the local authority has taken over.
"So it's an ongoing process. It's obviously a legacy issue from the collapse of the Celtic Tiger but it's one we are working on very attentively, and with a lot of co-operation from the local authorities."