The Government of Hokkaidō Prefecture commemorated its 100th anniversary in 1968, and original air vents and the octagonal dome were restored and installed to the building again to commemorate the anniversary, and government determined to continue preserving the building permanently. The following year, the building was listed as one of the National Important Cultural Properties. In 1985, the Archives of Hokkaidō was housed in the building. The Karafuto/Sakhalin Related Resource Library, which had been located in the Hokkaidō government office annex in West 18 since 1992, was also placed in the building in 2004.