The housebuilder has urged the industry and London boroughs to work with Sadiq Khan to deliver 66,000 homes a year in the capital.
Tony explained that if homes were to be built for all Londoners, then the private and public sectors needed to collaborate and that there was a solution if everyone worked together.
"Housebuilding is painfully slow, not because of build out rates or a skills shortage, but because of the uncertainty and division.
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"The reality is that most development in London involves complex, brownfield land, which requires a huge amount of time, expertise and capital.
“But in our experience, the mayor is open for business and prepared to fast-track sites that achieve the threshold of 35% affordable housing, which has to be the priority."
Tony’s call to action comes as Mr Khan starts to release £1.7bn of public funding in a bid to accelerate affordable housing delivery across London.
The Berkeley Group has land without planning permission which can deliver 20,000 more homes.
“To achieve this, we urge the government to reform the Community Infrastructure Levy and only apply CIL to sites with fewer than 100 homes.
“On larger developments, Section 106 agreements are a much better way to deliver local infrastructure and affordable homes."
Tony went on to add: "We will work within the mayor's policy because ultimately we all want the same thing – a National Park city where anyone can get on the housing ladder and invest their future in London.
“If we work in a spirit of real cooperation, these derelict sites can be turned into communities."