It follows the purchase of 135 homes in Maynooth by an investment fund.
The government will have to act to prevent investment funds buying up entire estates of new build houses, according to the Tánaiste.
Legislation is being worked on to reserve a certain amount of new builds for first time buyers.
Round Hill Capital and its partner SFO Capital, have purchased 135 homes in Mullen Park in Maynooth, and 115 homes in a new Dublin estate.
Tánaiste Leo Varadkar has said the government will need to intervene to stop this happening:

Kfm Weekend Obituary Notices
Two Men Charged In Connection With €4 Million Cocaine Seizure In Kildare And Wexford
Driving Testers At RSA Balloted For Industrial Action Over Concerns About Uninsured Vehicles
Homes Undelivered After Substantial Deposits Paid, Kildare Council Warns Of Potential Unauthorised Works
Over 1,000 E-Scooter Fines Issued As Kildare TD Calls For Tougher Penalties After Child Injured
Celbridge "Affordable" Homes Come With Council Equity Stakes
M4 Access Road To Castletown Will Reopen Next Week
Lucan Woman Pleads Guilty To Sending Threatening Messages To Tanaiste