The library, public baths and sculpture, known as 'The Hampstead Figure' have been recommended for listing in Grade II by English Heritage. Comments are invited by 12 April.
Lord Inglewood said:
'Following the success of the public consultation exercise on the 40 industrial, commercial and railway buildings, proposals to spot-list individual post war buildings have also been opened for public debate.
'We have asked the owners for their comments but I have made it clear that I am prepared to consider immediate spot-listing if there is any threat of preemptive action.
'I should emphasise that in deciding whether to list these buildings, I can only take into account comments that relate to their architectural or historic interest.'