Looking for my great-grandmother's sister's descendants in Poland.
My great-grandmother's sister was called Maria Mancarz (née Tammimäki). She was a Finn who married a Pole in the 1930's(?). Her last known address was Ul Różana 19 in Warsaw some time in the 1950's.
There are some ways e.g. : 1) write to actual manager of this real estate : WSPÓLNOTA MIESZKANIOWA NIERUCHOMOŚCI PRZY UL. RÓŻANEJ 19, UL. RÓŻANA 19, 02-548 WARSZAWA or 2) warsaw's city office: Delegatura Biura Administracji i Spraw Obywatelskich w Dzielnicy Mokotów, 02-517 Warszawa, ul. Rakowiecka 25/27 3) gavermant administration : Centralne Biuro Adresowe ul. Kazimierzowska 60, 02 - 543 Warszawa
According to no 2 and 3 you need fill the form application up as bellow and pay fee.
ad 2) in the link below they've explain how to do this, but just Polish version: