Is property financing feasible?

Hello Yvonne, in this case the bank asked me not to make any (public) advertising because the interest rate is an exception.

Yes.... Then....
You can see from this that a financing or a financing offer is always individual

Exactly, when you consider that we started at just under 2.5% and ended up at 1.62% under the same conditions, you can really talk about individual offers.

35% down. Did the banker receive the bonus payment from you this year or how did you convince him?

if you consider that we started at just under 2.5% and ended up at 1.62%

Now you will have to tell a little more. Over what period did this take place? There was recently a general drop in interest rates following the ECB bond purchase decision. A few percentage points might be due to that. The arguments that lead a bank to offer better conditions when all other parameters remain unchanged (property, creditworthiness, repayment, special repayment, term, ...) will surely be of interest to everyone here.

So I started on 07.01.2015. The decision was made on 03.02.2015. What does arguments mean? I got an initial offer from Bank 1, went to Bank 2 with it and presented it. Got a better offer from Bank 2 and went back to Bank 1. It took 3 rounds until one bank said now it’s over

The property, the financing, the creditworthiness, repayment, special repayment, term were the same conditions for both banks. Both wanted to have us, one was able to win us in the end...

Yes, a new building is something completely new, not being a supplicant at the bank for once.
However, these interest rates are only available with a high equity share.