A large mansion with planning permission to convert it into a 90-bedroom nursing home at Military Road in Killiney, Co Dublin, is to be offered for sale by private treaty at €1.5 million.

The overall site is 1.26 hectares (3.1 acres) and has frontage on to Killiney Hill Road as well as Military Road.

Hooke & MacDonald is handling the sale for Farrell Grant Sparks, which was appointed receivers to the Wexford-based developer Ellen Construction after its loans were transferred to Nama.

The 18th century Kilmarnock House was owned by the French religious order, the Cenacle Sisters, up to about 20 years ago.

The house was subsequently used as a residential language school.

It has been unoccupied since it was bought by Ellen Construction and is now in need of considerable repair and restoration.

The main house is 913sq m (9,828sq ft) with an extension providing an additional 1,290sq m (13,886sq ft). The original house has three main reception rooms with decorative plaster work and ceiling cornicing as well as bay windows.

There are four smaller reception rooms at ground floor level and an impressive hall and inner hall as well as a conservatory.

The first floor has 12 rooms while the east wing contains nine en suite bedrooms and a three-bedroom apartment.

In the west wing there is another two-bedroom apartment and 11 other rooms.

There is also a mews building in a courtyard setting with eight rooms in all.

Enda Moore of the selling agent says that whoever buys the landmark property will have the option of either providing a substantial nursing home, or restoring the building as a private residence. A range of outhouses are likely to be converted for residential use.

Kilmarnock House is located close to Ashhurst, the ostentatious home of the late Archbishop John Charles McQuaid, which is on the market for €3.5 million.