Of course, I am not an expert in this matter, but I can say that everyone who owns real estate must sign a contract with a real estate company. And I think it's obvious because if one of the owners does not want to sell the property, it will be illegal to sell it. It's just logic, man! Although, when I was selling my real estate, I discussed all such issues with this real estate company --
Satchells Hitchin, and they always dealt with everything well: documentation, registration, and so on. I hope my post will help you. Good luck!