1% repayment. Which banks? Requirements? Free land charge

You seriously compare yourself to the OP?

Just accept the experience report that even ING does not go below 1% with excellent creditworthiness

So 1% repayment with today's interest rate??? you want 1.5% interest and repayment? and when after 10 years the interest rates are at 5% comes the awakening???

so ING, Signal Iduna, Münchener Hypotheken Bank, they can do 1%
DSL Bank already wants 1.5%
many others at least 2%

but in this constellation everything is "negotiable!" I say that from 500K€

i.e. if you offer the collateral, they would also do 1%.

so you have to consider everything "as a whole":
optimal if you want to rent out the condominium:
- you do Forward + already withdraw a part, i.e. you immediately take out another loan as capital procurement!
- you then take this loan as capital procurement on the condominium as equity for the house!

possibly you then get 80% financing, depending on the region currently 20 years at 0.69% possible (often however with 2% or more repayment)

since for owner-occupied homes the interest is not tax-deductible, you should then make a deal = very good interest rates, gladly with 1% repayment + special repayments!

for rented property the interest may be higher, as you offset it tax-wise against rental income...

so as I said, negotiate with 2-3 banks, and get a complete package where the tax burdens are also taken into account with rental income (so also involve a tax advisor!).