Overview Designer Group has been awarded the mechanical, electrical and plumbing services package for the shell and core in the Tower, and the fit out of the four star hotel section at One Blackfriars. The building has 54 floors and forms part of a 74,925.sq.m mixed use development. Designer Group are working with Brookfield Multiplex on this project. Previously the Sainsbury’s Group Head Quarters this development will comprise of commercial space on the bottom floor, a hotel on three lower levels, 274 homes and a viewing platform on the 32nd floor.