You can access the Land and Mortgage Register website (though it’s only in Polish) to identify the property via a specific ID number that the owner can provide. It should list the name of the owner who should be signing your lease. Note that in Poland often an L.L.C. or other business may be the owner so you will be signing the lease with someone authorized from that company to execute the lease. The identity of these people are also a matter of public record so we can also verify their identities and trace them to the lease.