Former council offices within the Hillsborough village conservation area have gone on the market for £500,000.
There had initially been plans to turn the building - located in the heart of the village - into apartments.
The offices were formerly used by by Lisburn City Council.
That council was merged with Castlereagh as part of the reform of Northern Ireland's local government structures and the birth of the super councils.
Built in the 1960s, it still hasn't been given listed status despite being surveyed twice.
It's being sold by commercial property firm OKT on the instruction of administrators on behalf of Mangan Developments Ltd.
That property firm went into administration in July.
Nikki McVeigh, chief executive of the Ulster Architectural Heritage Society, said: "The building was constructed in 1964 in traditional style. It has been twice surveyed but not listed.
"It lies within the Hillsborough conservation area, in proximity to a number of important buildings which benefit from the protection of listing.
"The existing building may be seen to make an acceptable contribution to Hillsborough. Any proposals to alter or replace the building should be appropriate and sympathetic to the conservation area and the setting of the listed buildings nearby."
It's being marketed for a range of uses. That could include apartments, an office development or turning it into a pub or restaurant.
The building features 24 rooms across three floors and has around 7,000sq ft of floor space.
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