Communities Secretary Eric Pickles will announce whether the 1.5m sq ft Tithebarn development in Preston city centre can go ahead on 24 November.
A public inquiry into the retail-led development finished in June 2010. The development is led by Lend Lease, backed by Preston City Council. Grosvenor, the initial developer, withdrew in 2009 to concentrate on smaller developments.
If approved the scheme would be anchored by John Lewis and Marks & Spencer department stores along with further retail units, restaurants, a cinema, office space, 400 residential units and 2,700 car park spaces across a 36-acre site.
The scheme includes the refurbishment of historic market buildings, public realm works and a new bus facility.
Blackburn and Blackpool councils opposed the application at inquiry on the grounds the development was too large and would suck consumer spend from rival towns.