Mystery surrounds the future of a large Dunedin site containing a design firm, flats and warehouses.

The property at Anzac Avenue and Harrow Street changed hands on Monday after its owner reached an agreement to sell in June.

The site includes the Miller Creative building which is leased until next year.

It also contains a workshop leased to Otago Polytechnic, three student flats, a four-bedroom house, and a small warehouse.

It was investigated by the Otago Regional Council for their new headquarters, but the ORC was unsuccessful in securing the site.

Former owner Tony Johnston says a confidentiality agreement prevents him from giving any information about the new owners or their plans at this time.