The surname URBAN and LEWENDOWSKI does show up in Poland. www.herby.com.pl/herby Lewendowski in much smaller numbers in Plockie, Poznanskie and Walbrzyskie woj. (4 in 1990)
Check Ellis Island website for any Lewendowskis arriving and maybe going to your ancestor's neighborhood. In any case, you need to locate a name of a town in order to proceed with the research. Did you check any census, church they attended? Anyone a naturalized citizen?