Loan wise, there is no restriction that comes with HDB ownership. The maximum financing for your first property loan is currently 80% of the purchase price or valuation, whichever is lower and 60% for subsequent housing loans. If after the sale of your HDB, you do not have any other loans, then you can borrow up to 80%. The banks will have to check your income etc before confirming whether they can lend you your desired amount though.