Clement, who is deputy mayor in government relations said:
"The economy is in trouble, there's no doubt about that.
"The mayor Boris Johnson will put forward proposals for recession recovery that will be published before Christmas."
Ian Clement was speaking at New London Architecture's conference ‘Placemaking: creating a destination' today, 30 October.
The conference is part of New London Architecture's London's Towns exhibition held at the organisation's Store Street headquarters.
"We want to enhance the quality of life for Londoners. We want to promote good quality, liveable neighbourhoods.
"We do not want to repeat the mistakes of the past."
Ian Clement added that the Greater London Authority was gathering evidence and looking at the capital as a strategic whole:
"We need to ensure communities are just that - not simply large housing estates.
Clement added: "We can use great words like ‘sustainable' but we must mean it and ensure we do it."
For more from the conference, see Horticulture Week magazine 7 November.