I’d like to buy a private condo. I have about 150k cash to 200k SGD cash in the bank, payslips coming from a European company. Why doesn’t the banks allow me to have a loan?

It'll be much faster and accurate to just ask the banks directly. There are a few criterias which could be a red flag and could be different for each banks. To name a few:

1. a borrower may not have a debt-to-income ratio of greater than 43 percent
2. fees and points may not exceed 3 percent of the loan amount
3. lenders must verify a borrower’s income
4. no mortgages greater than thirty years and no interest only or negative amortization loans