Regarding years of lease left and how much I can loan?

Thanks to changes made last year in May, the amount you can borrow (LTV) now depends on whether the lease will last till you're 95. If it does, you can borrow the maximum of 90% of the purchase price.

If the lease does not cover you until you are 95 years old, your LTV will be pro-rated accordingly (the exact formula used by HDB is unclear).

e.g. using your example of a $400,000 flat built in 1970,

If you're born in 1980, you will only be 89 by the time the lease runs out, so you can't borrow 90%, you can borrow 83% or $332,000

If you're born in 1990, you will only be 79 by the time the lease runs out, so you can't borrow 90% or even 83%, HDB will only allow you to borrow 78% or $312,000.

Hope this clarifies!

Source: https://www.cpf.gov.sg/eSvc/Web/Schemes/CpfHous... ​​​