4, Des Voeux Road Central (2nd generation)/Former American Express Bank Building [c.1922-c.1956]

Timeline

a) 1919 - Work commenced on Marine Lot 103 (Section B) in Des Voeux Road Central of a large extension to the Hong Kong Bank. 

b) 1922 - HSBC's extension at No. 4 Des Voeux Road Central was completed. 

c) 1925 - American Express Co. relocated to 4A Des Voeux Road Central from 11 Queen's Road Central.

There appears to be a covered walkway that joins the main HSBC building to the new building. See here In later years, the whole building was known as the American Express Bank Building.

Sources

a) 1901.3 and 1956 maps of Hong Kong at https://www.hkmaps.hk/viewer.html 

b) 1919 and 1922 P. W. D. Reports

c) 1925 Directory & Chronicle for China, Japan etc.