Allies and Morrison has been appointed to lead the development of Croydon's Old Town masterplan.
Tim Naylor, head of spatial planning at the council, said the practice had been selected through a competitive tender process for the job, which will see a multi-disciplinary team work with Croydon Council, Old Town businesses and residents to develop ideas for the area's future.
In an update posted on the Croydon Town Team section of retail guru Mary Portas' website, Naylor said Allies and Morrison would bring expertise in architecture, heritage, urban design, transport planning, economic development, landscape architecture and urban planning to the project.
He said: "The purpose of the Old Town masterplan is to improve the built environment for people living, working and shopping in Old Town.
"It will be a planning guidance document that sets the parameters for development of the buildings, streets and public spaces in Old Town and also looks at how movement in, out and around the area could be improved over the next 20 years.
"It will also recommend how the heritage assets of the area – its treasured buildings and historic street patterns – can be preserved, enhanced and celebrated.
"The masterplan is funded by the Mayor of London and Croydon Council, and will be formally consulted on towards the end of this year."
People who live, work and shop in Old Town are being invited to an ideas workshop at Matthews Yard on 26 March, 6.30-8.30pm.