The merger of the Nightingale and Hammerson care homes was formalised on Monday. The homes will retain their individual identities but share a governance structure.
"This is a move that will bring considerable benefit to both homes, as well as to the community at large," said Nightingale (and now Nightingale Hammerson) chair, Harvey Rosenblatt.
"Both organisations bring a wealth of experience to the partnership, as well as a common ethos that places the utmost importance on providing pioneering care."
Hammerson co-chair and Nightingale Hammerson trustee Tony Michaels believed the partnership would be "fantastic news for residents, their relatives and the whole Jewish community in and around London.
"The UK's population is ageing and in the coming years we will be examining how we can design our accommodation to fit the needs of these changing demographics."