The property – Lower Lodge at Stopham near Pulborough – is a Grade II listed former gatehouse at the entrance to Stopham House, which was once a grand manor house and is now divided into private apartments.
The building is thought to date from the 1870s, with a later addition, but has not been occupied since 1965.
Estate agents RH and RW Clutton say: ‘The building has deteriorated considerably in its now very dilapidated state.
“The planning permission has been granted for the restoration, extension and re-establishment of residential use of the building.
“The plans offer a unique opportunity for an incoming buyer to rebuild the original structure, as well as add a significant extension to create a stunning ‘one of a kind’ home. “The property sits on private land, which also requires a reinstatement, and spans approximately 0.36 acres.
A condition of planning permission is that a community infrastructure charge of £38,670 is payable to the South Downs National Park Authority at the start of development.
During this time mains water is available for connection to the property, but whoever purchases it will need to make their own arrangements to connect to the mains gas supply.
And they will have to make their own arrangements for the installation of a private drainage system.
Petworth-based officers Cluttons say: ‘The existing building structure is in a very dangerous condition and all visitors are advised that access beyond the security fence is strictly prohibited.’
Visits can be organized by appointment.