While appealing against the rejection of plans to partially demolish Rauceby Hospital to make way for 100 homes, the owner of the former hospital ihas put the site up for sale.
It is seen as part of the process of proving the site has no alternative uses or the ability to secure funding for restoration of the derelict ward blocks at the heart of Greylees.
The site is being advertised for £1million through Lambert Smith Hampton.
Robert Galij, Planning Director at Barratt Homes North Midlands, has written offering it for £917,674 to Sleaford Town Council and North Kesteven District Council, whose planning committee turned down the application
Barratt Homes is also inviting financial assistance to preserve the buildings.
Mr Galij said: “We are currently going through the planning appeal process and are exploring all the options for the conservation of the site.
“As part of this we are marketing the land for sale and seeking expressions of interest.
“We still feel that our proposed redevelopment, which would conserve three of the existing nine buildings, would substantially benefit the public.
“However, the future of the site will be determined through the public enquiry later in June.”
The Town Council rejected both offers at its meeting on Wednesday night.