I just received an old newspaper from Birmingham. The daily, dated February 1931 contains an advertisement of "Imperial Bank of Persia".
In various online sources, it is mentioned that Imperial Bank of Persia has been active since 1889 to 1929 but it can not be correct because this advertisement has been published in 1931. Anyway:
The beautiful building of Imperial Bank of Persia is still in operation in Tehran under the name of Bank Tejarat, located in Toupkhaneh Square. The designer of the building is Markar Galstiants (1885-1985), the Persian-Armenian architect.
IBP was the first modern bank in Persia / Iran and established with a concession from the Persian government to Baron Julius De Reuter.