Dublin City Council has come under fire for rejecting dozens of properties offered as new homes by the National Assets Management Agency (Nama).
The council turned down 146 units in a single development in the capital because of concerns of an "over-concentration of social housing".
Council chiefs rejected a further 46 units in a development in Ballymun after claiming the properties would not be consistent with rules surrounding local "tenure mix".
This is despite the fact the local authority has sought to construct a number of social housing developments in Ballymun since declining the Nama properties.
A further 32 units across two developments were turned down because of "poor condition and structural issues".
Eight more potential homes were rejected because of low demand.
The details of the reasons behind the refusal of Nama properties is contained in documents obtained by Fianna Fail under the Freedom of Information Act.
Nama has offered Dublin City Council 638 units. The council confirmed demand for just 400 of the units.
The party's Environment spokesman, Barry Cowen, questioned the decision to turn down almost 200 units because of concerns over tenure mix.
"The declining of these units on the basis that their use as social housing would lead to an over-concentration of social housing in any particular area - and hence not be consistent with local tenure mix - is, no doubt, replicated across Dublin and other local authorities," Mr Cowen told the Herald.
"There is a housing crisis and the rejection of homes on the basis of tenure mix needs to be seriously examined," he added.
A council spokeswoman said:
"Dublin City Council does not wish to comment on remarks attributed to Fianna Fail in relation to Nama properties."