Citi will require a 35 per cent deposit for loans on all apartments built less than two years ago, and for any apartment on a list of 90 postcodes Australia-wide.
Citi is clamping down on lending in 90 postcodes around Australia, amid concerns that strong building approvals could lead to an oversupply of homes.
Loans for properties in the suburbs, which are mainly in Sydney and Melbourne, will require a deposit of 35 per cent.
The new guidelines, which have been distributed to mortgage brokers and reported in the Australian Financial Review, apply to all apartments built less than two years ago, and to any apartments on the list.
Citi's report Property outlook for 2017 - Will the boom continue? states:
"If you are considering a new property investment in Melbourne or Brisbane, be wary of inner city off the plan apartment developments.
Citi Economist Paul Brennan, who co-authored the report, said, "We've never seen anything like the current levels of apartment construction before, and it could result in short-term oversupply. This will weigh on any potential for further capital gains - there could even be some downward pressure on prices, and also on rental yields."
Citi's 'blackspot' suburbs
New South Wales
ACT
Western Australia
Victoria
Queensland
South Australia
ING Direct has also responded to heightened risks in the Australian property market. The global bank has reduced the minimum sizes for apartments in will finance by 20 per cent to 40 square metres.
Read Citi's 'Property outlook for 2017 - Will the boom continue?' report in full.
Read more about lending in the Australian market:
Other lenders fill the gap as big four clamp down on foreign borrowers
New rules mean lenders see 'positive data' when assessing loans