If you are a buyer, you need an ID card and money (if you pay by mortgage loan, documents as instructed by the bank). If you sell a property, you need an ID card, declaration of administrator, acquisition contract (the contract which you have acquired ownership of the property), public document. Property must be registered with the district authority - the cadastral department, therefore, must be registered on title deed. As the title deeds are available online, you may not bring the original from land registry (but if the payment is done through a mortgage, banks sometimes require it). When it comes to selling an apartment, you will need a statement made by the administrator of a residential building that the apartment has no outstanding debts against the administrator. Then a deposit to the land registry is necessary, it is prepared by the real estate agency and revenue stamps worth € 66.