The architect of developer Great Portland Estates' 12-storey office building on London's South Bank has been revealed as Allford Hall Monaghan Morris.

The development, which will include 18,500 m2 of space in the tower and a second block, will be built on Tooley Street, on a site close to More London, one of the biggest developments on the South Bank.

Laing O'Rourke won the contract to build the office scheme, which will also include 20 flats, in a deal worth about £50m. Contractors Skanska and Sir Robert McAlpine are understood to have also bid for the contract.

It is AHMM's second commission for GPE on the South Bank, after the architect was recently appointed to design a scheme on a 0.4 acre site on the corner of Southwark Street and Blackfriars Road.

A planning application is likely to be submitted for the scheme, which is opposite the Beetham Tower residential development, later this year.

Both buildings form part of GPE's expansion out of its traditional market north of the Thames.