Chancellor George Osborne and London Mayor Boris Johnson were at a former gasworks which has been deserted for 40 years to launch the scheme. They say the site in Tottenham can now be built on after they removed planning restrictions to get more homes built quickly.
Fifty thousand new homes will be built, 40% of which will be affordable, housing 250,000 people.
More top news
Liverpool Street and Stratford stations quickly became overcrowded this evening after a person was hit by a train.
Newly re-elected Labour leader Jeremy Corbyn describes his relationship with Mr Khan as "fine", even though they haven't spoken recently.
The kittens were in a poor condition when they were rescued, but are now putting on weight and will soon be ready for new homes.