Be aware of friendly Realtors introducing you to an advertised property you can find yourself online and expecting a fee for the reading skills. I have also noticed a few asking for proof of you having the deposit and income quoting German law requirements re money laundering. If I did require one I would stay away from an agent like that. So that is half of your interested buyers walking away. I feel the information is private and the banks and tax office are welcome to look all they want, but not a Realtor just so I can view a property.