Hello Sperit, do you meet the funding requirements for the Z15? If yes, then definitely choose option 1 and save the difference amount you would have with a standard bank financing (with 280,000 EUR about 1% interest advantage is already 28,000 EUR in 10 years + 1% repayment which you would also have higher with the bank loan is another 28,000 EUR) in a [Bausparer]. Then, if I calculate savings of 15,000 EUR in the last 5 years, you can repay 150,000 EUR interest-secure after 15 years.