Kato was the overseer of “Otora,” the company who designed and constructed the Otaru Civic Hall, present Hokkaido Chuo Bus Company Main Office, Former Iwanaga Clock Store, and Bank of Japan Otaru Branch.
Being the largest contributor, Kato dedicated himself to the development of the historic streets of Otaru we see today.
The Otaru Civic Hall had a tiled roof, while the office had a copper sheeting for a roof.
It is the largest existing timber office of its kind in Hokkaido.