The 17,000 sq ft Pear Tree Street site in Islington has permission for 45 apartments with 3,500 sq ft of fully-glazed office space on the ground floor.
The five to six storey building will comprise textured brickwork with infill glazing, light-coloured render elevations, large windows and a combination of inset and protruding balconies.
Last month, Mount Anvil, in joint venture with Notting Hill Housing Group, exchanged contracts with London & Stamford on the sale of 107 private residential apartments on nearby Seward Street, EC1 for just under £50m.
Killian Hurley, chief executive of Mount Anvil, said: “This latest Pear Tree Street acquisition is in line with our strategic focus on the inner London Boroughs.”