Rio Tinto is seeking a joint venture partner to redevelop its former headquarters at St James’s Square in London’s West End.

The company, one of the world’s largest mining companies, plans to redevelop 5 and 6 St James’s Square into an offices and apartments scheme.

Rio Tinto, which relocated to Eastbourne Terrace in Paddington and Aldermanbury Square in the City in December last year, plans to develop 125,000 sq ft of offices and 15 apartments at the building.

The plans, designed by architects Dixon Jones, have been granted planning consent and also include a new art gallery.

Rio Tinto said a number of development companies had been sent pre-qualification documents and a shortlist will be drawn up over the coming weeks.

Following the development, which is expected to complete in 2010, Rio Tinto intends to hold onto the building as an investment.

Cushman & Wakefield is advising.