The contentious site has been the scene of a bitter battle between developer Arrowcroft, which is backing the Aukett scheme, and landowner Stanhope, which is championing proposals by Foster and Partners for the same site.
Until now the Arrowcroft bid had received full council backing, even though the proposed development has been called in by the Government Office for London.
However, following last Thursday's council election results, which saw Labour lose its hold on power in the borough, questions have been raised about whether the incoming Tories will support the project.
Croydon's Conservative cabinet member for planning, Chris Wright, said: 'We haven't examined all the facts - it's only been a few days since the win - but we will be looking at all the various projects and whether we want to proceed.
'It is a very difficult site and needs very careful and proper planning. I can't say yet if we have come to the best solution.'
Yet a spokeswoman for Arrowcroft maintained that the election result would have no bearing on the progress of the Aukett designs. She said: 'The change in power shouldn't make any difference at all.
'There was unanimous all party support for our planning application - as there was for the CPO resolution.'