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.
More top news
Prince Harry's Invictus Games is hailed a success as it closes with star performances from the Kaiser Chiefs, Ellie Goulding and Diversity.
Levi Roots from Brixton is the UK's richest reality star and Leone Lewis also makes the Top 10, but how did other Londoners fare?
The mayor is expected to be joined by his wife when he asks local Conservatives to choose him as their candidate in the general election.