The purchase of €11 million comes after a full Value for Money assessment and an independent commercial valuation, and has received formal approval from the Department of Public Expenditure.
The State has purchased key lands at Castletown House in Celbridge - a move that could end years of access problems at the historic estate.
Kfm understands the lands have been purchased at a price of €11 million.
The Castletown lands were sold for €5 million in 2023.
The move is expected to secure long-term public access and stability for one of the county's most important heritage sites.
The purchase comes after a full Value for Money assessment and an independent commercial valuation, and has received formal approval from the Department of Public Expenditure.
In 2023, after adjoining lands changed hands privately, the entrance and car park beside the M4 were shut off.
In July, Castletown House Parklands reopened after a meeting involving the OPW, Minister Kevin “Boxer” Moran, Gardaí, local representatives and community groups.

More Time To Be Given During Exams For Students With Additional Needs
Man Charged With Sexual Assault Of 10-Year-Old In Saggart Deemed Fit To Face Court
Government Levy On Health Insurance Premiums Set To Increase By Around 10%
Building Homes But No Infrastructure: Kildare TD Delivers Stinging Rebuke To His Own Government
Ryanair Passenger From Newbridge Found Guilty After Homophobic Slurs In "Toasted Sandwich" Row
Major Delays After Multi-Vehicle Incident On M7/N7 Near Naas
High Court Judge Orders Enoch Burke Back To Prison, Calling Him A “Baleful And Malign Presence”
BREAKING: Simon Harris Announced As New Minister For Finance