BDP has been asked by developer Grosvenor to take forward Terry Farrell's original masterplan for the Tithebarn regeneration project in Preston city centre.
Ironically, the move will mean the practice will now oversee the destruction of one of its own, seminal buildings in the town where the firm was founded in 1936.
BDP architects Keith Ingram and Charles Wilson masterminded the design of the huge concrete structure, built between 1968 and 1969.
However in recent years the building has been criticised for hampering the redevelopment of Preston.
Despite strong opposition from local campaigners including an 84-year-old former Desert Rat (AJ 18.11.05), the garage is set to be bulldozed.
A BDP spokesman said: 'In the bigger masterplan the bus station would go. It was a great building of its time, but it does prevent the comprehensive redevelopment of central Preston.
He added: 'We are now working with the masterplan and taking it forward. We are looking at the options and tweaking things to suit specific retailers.'