Greystar UK Multifamily Fund I is first in a flagship series of UK rental housing funds. : Greystar Real Estate Partners is planning to raise £750m (€849m) for its first UK built-to-rent fund. The manager has launched Greystar UK Multifamily Fund I (GSUM I) – the first in a flagship series of UK rental housing funds – to target develop purpose-built rental housing properties in London. Bob Faith, founder and CEO of Greystar, said: “There’s a significant need for professionally developed rental housing in the UK as the current stock is under-supplied, outdated and poorly managed.