In our case, we had sold my apartment and it was arranged in the notary contract that we were allowed to live rent-free in the apartment for about another year. The purchase price was still due immediately because the buyer also wanted to secure a financing offer, and I believe he paid €2000 less for it. In other words, you just need to find someone who agrees to that. Otherwise, you can basically agree on anything at the notary... If no buyer had been found, the bank would have provided bridge financing, but that would have been a bit more expensive. You always have to calculate how to get out of it best. You can also best estimate whether or how well your current property will sell. My experience as a part-time real estate agent is that you can usually sell a new building or a very sought-after location well, but an old house in the countryside on a main road, and possibly in need of major renovation, sells like sand in the desert...