Architecture and Design Scotland (A&DS) has refused to back BDP's proposals for its extension to Glasgow's Buchanan Galleries.
The UK's largest practice is planning to extend the Glaswegian shopping centre, which was opened in 1998 and designed by Jenkins and Marr Architects, now part of the SMC Group.
But the Scottish design watchdog remains 'unconvinced' by various parts of the scheme, and stated that many of its 'concerns raised in the previous report have yet to be addressed'.
The AD&S report stated: 'We are not convinced by the requirement for the proposed link bridge and concert atrium building, and we question the benefit these would bring to the city.
'We feel the project could be more advenurous in density and more ambitious in creating an integrated trasnport hub for the city.'
Although still at an outline planning stage, and despite being backed in principle, the project still needs 'further consideration' according to A&DS.
The report added: 'We recognise the considerable amount of work that has already gone into the designs at this early stage, for which the project team are to be commended.
'However, we feel that the project could show more ambition in its strategic approach to the development of the whole area and that there are lost opportunities in this respect.'by Richard Vaughan