108 flat building, 3,000 yuan per square meter, which is 324,000 yuan.

The down payment for the building is 40% of the total building price, namely 129600 yuan. The loan amount is 19500 yuan. The annual interest rate of the loan for 5 to 30 years is 0.538%, the loan interest is 1049 10 yuan, and the total loan amount is 2999 10 yuan. Loan for 20 years, annual repayment 14995.5 yuan, monthly repayment 1249.465 yuan.