Central Bank of Bulgaria Bulgarian National Bank (BNB) Postal Address: 1, Knyaz Alexander І Sq., 1000 Sofia, Bulgaria BNB Cash Centre Address: 10, Mihail Tenev Str., Poligona, 1784 Sofia, Bulgaria Telephone: (+3592) 91459 Telefax: (+3592) 980-24-25; (+3592) 980-64-93