In academic excavations conducted in 1987 to 1988, structural and other remains of the Burakuden hall were found, and the site has been designated as a national historical site, with the remains designated as cultural properties (archaeological materials).
1987年から1988年にかけての発掘調査により、豊楽殿の遺構と遺物が発見され、国の史跡と重要文化財（考古資料）に指定されている。