What conditions can I expect?

that only works if you get better conditions through higher repayment! if the conditions remain the same, whether you have 2% or 4% repayment, you only end up paying more interest to the bank (if you borrow more!). with 1/10 or 2/10, the interest should effectively be 0.69%, 0.59% over 20 years??? good luck with your search...

Huh? The OP initially wanted to repay with 1-1.5%. He will probably have a harder time finding a very good interest rate than with 2%. For example, Schwäbisch Hall does not finance below 2%. If he finds a lender that offers him an interest rate of 1.3% p.a. for, say, 1.5% repayment, he will be worse off than if he repays 2% from the start but takes on more debt and achieves a better interest rate through the higher repayment, because there is more choice among banks. For example, Schwäbisch Hall at 0.99% p.a.

I have another question about financing.

As we have learned, the standard land values for the new development area have been increased by €130 (!) per sqm. However, we acquired the plot at the old standard land values from the municipality. I am aware that the standard land values currently play more or less no role on the open land market. But could this increase in the standard land value be advantageous for the future financing of the house?

Stop your lousy advertising already. You can't be that good and in demand if you're fishing for souls here like this.