The London Planning Advisory Committee's glowing report last week about Lord Foster's 'outstanding' designs for the Greater London Authority building on the south bank of the Thames was tempered by its concern about the building's 'inflexibility'. Although the government has emphasised that the capital's new body will be a 'streamlined, small organisation' the building could not cope with more than the 400 staff currently regarded as the start-up component, lpac says. That would 'constrain' the Mayor and lead to the use of annexes elsewhere, thus detracting from the idea of a single, holistic, 'joined-up' strategic authority. The Mayor might, for example, wish to bring in staff from other agencies. And he or she might also want to import a collection of London paintings such as those by Canaletto, Turner and Monet, or re-house the Greater London Records Office. History has shown that all local and national government buildings outgrow their original buildings so lpac suggests 'giving some thought' to linking in to other blocks in the masterplan site in the future. It will be a 'beautiful and monumental home for the strategic authority', it says - but perhaps not for all of it.