1.9 The redevelopment of Main Building will result in a small reduction in the net internal area (nia) of the building (i.e. the useable area), but MOD will be able to accommodate more staff in it as individuals will on average occupy 19 square metres per workplace compared to 24.7 square metres prior to redevelopment. The wide use of open-plan space means that office areas can be easily adapted to support future organisational change at low cost. All staff of B1 level (Navy Captain, Army Colonel, RAF Group Captain and below) will be in open-plan accommodation. Figure 4 shows that this amount of space per person compares well with industry practice.