The chair of the Public Accounts Committee has said it will be writing to the OPW to seek more details on the 11 vacant properties in the Phoenix Park.
John Brady said the committee would like to clarify if the property that was provided to former garda commissioner Drew Harris is "lying vacant".
Around €400,000 worth of refurbishments were completed on the property.
The property in the Phoenix Park was leased to An Garda Síochána between 2017 to 2025 and the rent stayed the same during these years.
Mr Harris served as Garda Commissioner during this time.
Security systems at the house in the Phoenix Park, where former Mr Harris lived during his time in the role cost €212,000 and there was an annual monitoring charge of €2,500 on the property.
"There are 11 vacant properties which require refurbishment and are not currently suitable for occupation.
"I think we need further information on that - what plan is in place to bring them into use, a timeframe for that and an estimated cost," Mr Brady said.
He said the OPW has stated that the vacancy periods vary, depending on the condition of the property, ranging from the early 2000s, to September 2025.
"We did have a lot of discussion about the use of one of the properties in the Phoenix Park by the former garda commissioner," he said.
Mr Brady said the former commissioner ended his tenure last September.
"The concern I would have is that the property that had that extensive work carried out is possibly now vacant," he said.
"Which would be a scandal on top of a scandal."
Sinn Féin TD Cathy Bennett also suggested asking the OPW how much the rent is for each property.
Quarter of people made homeless last year were leaving direct provision, committee hears
At the committee hearing, Fianna Fáil TD Paul McAuliffe asked if there is engagement between the Department of Justice and Department of Housing regarding people who are leaving direct provision and entering homelessness.
He said that figures from the Dublin Region Homeless Executive (DRHE) showed that 25% of single people made homeless last year were leaving direct provision.
Department of Justice, Home Affairs and Migration Secretary General Oonagh McPhillips said: "We don't exit people into homelessness."
Assistant Secretary General David Delaney added: "Nobody is moved out of direct provision with status, we do accommodate people, we are accommodating 5,000 people who have refugee status."
Mr McAuliffe asked if they are accommodated outside of the homeless services.
In response, Mr Delaney said: "We do, we absolutely do."
The Fianna Fáil TD asked how the DRHE's figure tally with the Department saying that people are accommodated.
"We do work very closely with the DRHE and the Department of Housing colleagues," said Mr Delaney.
He said he believes the statistic is "someone who previously lived in direct provision is presenting at homeless".
"There is nuance within it," said Mr Delaney.
He said the 25% is a very small proportion of those who have "managed to integrate into communities well".
"I just think it's a very significant figure," said Mr McAuliffe.
"There is a cost of providing direct provision. There is a cost for providing emergency accommodation. We should be looking at those two costs and acknowledging the rights of people who are fully entitled to housing."
