BAM is nearing completion of the £850m main construction.
However, UK security chiefs demanded control over the fit-out process rather than trust BAM. Three other NATO nations have also opted to control their own fit-out contracts. The rest are happy for the main contractor to do the work.
The UK delegation has the fourth floor, covering 1,900m2 gross internal area.
Fit-out works for the UK offices are expected to take place between January and October next year. Mobilisation on site can begin in October 2014.
The Foreign & Commonwealth Office (FCO) is inviting interested parties to attend a supplier briefing to be held in at the FCO offices in London on Monday 19 May at 2pm.
To register your interest, email firstname.lastname@example.org with the name of your company and the full names and positions of the two (maximum) delegates who wish to attend.