3 Merchant Square, a 21-storey development of 159 luxury apartments and 42 standard apartments, is due for completion in summer 2014. 1 Merchant Square will be a residential tower of 42 storeys designed by Robin Partington Architects, which will be the tallest building in the City of Westminster, containing just over 200 residential units, a 90-room boutique hotel and a sky bar. 2 Merchant Square will be a 16-storey office building providing of Grade A space with of retail space. 6 Merchant Square will offer 119 apartments over 15 floors.