In late March, Sadiq Khan took over the application for the redevelopment of Newcombe House in the Royal Borough of Kensington and Chelsea after it was refused by the local council.
Last year, no affordable homes were given planning permission by the council.
The mayor – who can call in planning applications under article 7 of the Mayor of London Order – secured amendments to the plans that increased the level of affordable housing from 17% to 35%.
The total number of homes in the scheme has now risen from 46 to 55, with 23 homes being affordable – an 18 percentage point increase from the previous version of the plans.
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The scheme will include a medical centre, step-free access to Notting Hill Gate underground station and a new public square with permanent pedestrian and cycle access.
Khan stated that he would use all the levers at his disposal to increase the supply of council, social rented and other genuinely affordable homes that Londoners need.
“London’s housing crisis won’t be solved overnight, but I hope this will send a clear message that I expect developments to include more genuinely affordable housing and other benefits for local people."
Earlier this month, the mayor of London boosted the level of affordable housing at the remaining three Olympic legacy sites to 50%.
In July, he also called for stamp duty receipts to be devolved to London to help fund affordable homes.