New images have been released showing how the revamp of a neglected former office block designed by John Madin will look.

The two CGIs (above and below) have been unveiled as Solihull planners back the redevelopment of the old Powergen offices which have stood idle for two decades.

The site, on the A34 in Shirley, is to undergo a wholesale regeneration which will spell the end for yet another building designed by the renowned Birmingham architect.

Shirley Advance, the joint venture team behind the Parkgate retail-led scheme opposite the Powergen site, has won planning permission to create a new ExtraCare retirement village, houses and flats, and a new Asda petrol station with convenience store.

The development, which will have an end value of at least £75 million, will comprise 261 retirement apartments and 113 new homes by Lioncourt, comprising 57 two-bedroom apartments and seven two-bedroom, 31 three-bedroom and 18 four-bedroom houses.

Shirley Advance, a JV between Helical Retail and Coltham Developments, teamed up with Solihull Metropolitan Borough Council and supermarket chain Asda to bring forward the development.

All of the existing buildings on the ten-acre site will be demolished, including the old Powergen tower and the redundant multi-storey car park.

John Madin buildings set for change

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This is the latest in a long line of buildings designed by Madin which are being consigned to the history books (see video above).

Demolition work continues apace on Central Library and NatWest Tower in Birmingham city centre, Adrian Boult Hall is being replaced in Eastside and the Edgbaston home of Greater Birmingham Chambers of Commerce is one of those which could still be lost.

However, a former office block at 104-106 Hagley Road, also in Edgbaston, is being turned into student accommodation ready for this September.

Site clearance and demolition work in Shirley will commence this spring and it is envisaged the first new homes will be ready by the end of 2016 and the petrol station shortly afterwards.

The remaining homes will be built in a phased basis, with the final units due to open in 2018, and the ExtraCare retirement village complete by the end of 2019.

Robert Birch, from Shirley Advance, said: "This is great news, after so many years of uncertainty surrounding the old Powergen site. We are looking forward to getting the project under way."

CGI of the interior of the new ExtraCare village development in Shirley
CGI of the interior of the new ExtraCare village development in Shirley