The developers of the Chelsea Barracks site have been told they must start delivering the homes they promised, or to sell up and release the land.
The project has been put on hold, apparently because of the current economic climate. But Westminster Council is urging the Qatari developers to start building their vision.
Cllr Jonathan Glanz from Westminster Council.
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Donald Trump is to visit the UK on July 13 and hold bilateral talks with Theresa May, Britain's ambassador to the US has said.
The Football Association has announced it has received an offer to buy Wembley Stadium.
The most hotly-tipped date is July 13, following the Nato summit which the president is due to attend in Brussels on the previous days.