Southwark Council's leader Peter John has been elected chair of a cross-party organisation representing London's 32 boroughs as well as the City of London Corporation.
Developed through a partnership with housing association Notting Hill Genesis and Southwark Council, the new centre is one of a mix of community facilities to be brought forward as part of the residential scheme at the 1-ha former Amersham site on the former Aylesbury Estate.
It will including an early years' nursery, library, public open space as well as a range of homes and retail units including a cafe and pharmacy.
Designed by Duggan Morris Architects (DMA), the centre will be managed jointly by local GP practice, Nexus@Aylesbury Medical Centre (AMC), Guy's and St Thomas' (GSTT) Community Health, with assistance from NHS Southwark Clinical Commission Group (CCG).
Both facilities are currently located in the area, adjacent Taplow House. GP Neal Murphy at Nexus@Aylesbury Medical Centre, said: "The design and function of the building will serve our patients and the healthcare staff who care for them very well."
The relocated facilities is set to meet the expanding population and to provide a wider range of services.
Malcolm Hines, chief finance officer at NHS Southwark CCG and the senior responsible officer for the project, said: "The building will, in the future, be able to offer a wide range of services to a significantly increased population in the area."
Labour maintained its majority in May's local council elections, holding 49 of the 63 seats on the council.