Compare construction financing offers - Which one is realistic?

Personally, I would have no problem taking on financing that lasts until I am 70, until it is paid back. At 70, I want to live in a small, cozy rental apartment with a terrace/small garden/balcony and "live off" the money from the house sale. Let landlords and management take care of the maintenance and care of the apartment or the rental building. I don’t want to deal with or pay for that anymore.

Personally, I would have no problem taking out a loan that I would still be paying back at 70. At 70, I want to live in a small cozy rental apartment with a terrace/small garden/balcony and "live off" the money from selling the house. Let the landlords and management take care of the maintenance and upkeep of the apartment or the rental building. I don’t want to worry about or pay for that anymore.

Does the bank have no problem with that? After all, you are an expert

Not so far. A big "German" bank, for example, makes it very easy for itself.

If in doubt, it does not check your creditworthiness after reaching retirement age, but you insure the bank that the property will be sold upon retirement. I can confirm this from my own experience (with rented properties).

Apart from that, the requirements have meanwhile become significantly more relaxed regarding the topic "financing in old age." Even pensioners can now finance quite easily again.

That only works if the property remains "stable" or the residual debt is not that high at the start of retirement, right?

That is of course true. The old shack at the Polish border in the middle of nowhere or high pension payouts at retirement didn’t work out so easily. But it’s basically common sense – and most banks think the same way. There are some guardrails you can’t bypass, but otherwise, many things can be discussed.