To make the building solid and lasting, the Japanese used steel reinforcing bars as thick as railway rails, and built the walls in natural stone and brick, giving the whole structure a fortress-like solidity. Although the American forces dropped 500 tons of bombs on the building in the latter stages of World War Ⅱ, its basic structure remained unscathed.
當時，為了讓總督府穩固耐久，日本人以類似火車軌道的鋼條做鋼筋，再砌以厚實天成的石塊、磚牆，因此整體結構固若金湯，即使二次大戰後期美軍以五百噸炸彈轟炸，也未能毀損它的建築結構。