The school has been unused for several years, with previous proposals for educational, health and community uses failing to progress.
The former St Paul’s Secondary School site on Main Street in Monasterevin has been sold, with plans now emerging for a new supermarket development.
The long-vacant school building has been purchased by Lidl Ireland, which is expected to seek planning permission for a new store on the site.
The school has been unused for several years, with previous proposals for educational, health and community uses failing to progress.
Cllr Kevin Duffy (FG) said: "A development of this scale has the potential to greatly enhance activity along Main Street, complementing existing local businesses and strengthening the services available to our growing population."
He explained how "numerous efforts were made to identify a suitable new use for the site" - ranging from educational, special education and health-related facilities - but those proposals did not progress.

Families Could Face €1,000 Rise In Annual Food Bills Amid Farming Crisis
Over Half of Cigarette Packs Surveyed In Newbridge And Naas Had No Irish Duty Paid
Celbridge Brewery CEO Warns Of Mounting Costs Facing Craft Beer Sector
Amhrán na Laoch Songwriting Competition Confirmed for Irish Music Month 2026
Government Announces Major Overhaul of Anti-Money Laundering Rules
Maynooth University Hosts Special Solar Eclipse Event This Evening
Johnstown Mother Says Today's Solar Eclipse Means Something Extra Special For Her And Her Son
Three Men Detained In Kildare And Dublin Garda Stations Following Brothel Keeping And Organised Prostitution Arrests