Thank you first of all, we have an appointment with the notary and will get advice. As I said, with a project like this such things need to be clarified beforehand. Let's see what he says.
Solution 3: You buy an apartment with financial participation from your partner as value compensation. It is financed through the rental income and registered in the land register under the daughter's name. This way, everything is already arranged for the daughter, even the inheritance tax.
The court to be involved will not agree to this. Ownership entails obligations that the courts reject for children.