The local authority turned down a request for retention permission earlier this year.
The national planning regulator is investigating plans for a discount retail store in Westmeath.
The company behind Mr. Price - Corajio - is appealing Westmeath County Council's decision on its Athlone store to An Bord Pleanála.
It had applied for retention permission for its warehouse in Cornamaddy, but was rejected in April.
The company was not authorised to use the site - according to local authority planners - and granting retention "would set an undesirable precedent for similar developments" in future.
It also stated the out-of-town-centre location was not in line with efforts in the Westmeath County Development Plan to avoid urban sprawl.
The case is due to be decided by 26th September.
Lowry Breaks Title Drought With Magnificent Irish Open Victory
Michael O’Leary Rejects Rape Comment Criticism And Refuses To Apologise
Gardaí Investigating Graffiti Damage To Three Buildings In Laois
Irish Business Leaders Unite With Rory Best For 378km Charity Challenge
Midlands MEP To Host Youth Policy Dialogue On Future Of Farming
SETU Launches Collaboration With The All Ireland Institute Of Hospice And Palliative Care
Appeal Lodged Against Plans For 30 New Homes In Laois
€100k Funding Announced To Support Students At International STEM Events