From the Kazan hot springs hotel in the Japanese domination period to the current Beitou Museum, the Grand Room is so far the largest and the only one of its kind remaining in Taiwan. The architecture is almost 100 years old and has witnessed a prosperous page in Beitou.

The operative owner established a new two-storey wooden hotel space behind the first building in 1938. The new part was named Kazan "Shinkan" (New Hall). On the 2nd floor of "Shinkan" was a banquet hall "the Grand Room" of 60 Tatami (around 97.2㎡) including a Hinoki (Chinese cypress or juniper) stage for Geisha performance which could contain around 100 persons. It was a quite luxurious expansion.  

Around 1999-2000, when the ceiling on the 2nd floor was opened, a wooden board ("Munafuda" in Japanese) hanging on the primary beam (Tsurigi) was discovered. Generally, when there is a beam-setting ceremony in Japanese traditional constructions, the "Munafuda" board will be written with the recording of the construction name of the building, the beam-setting date, the owner of the building, the architect and the names of diverse craftsmen.  The writing style of the "Munafuda" board of Kazan Hotel is different from most of the other Japanese constructions; the contents of the "Munafuda" board are presented in Gohonzon (御本尊), which is the relic of Japanese Buddhist "Nichiren school."