Later, its value as the remains of a Shukukan for the Shogun family was appraised in 1972, after avoiding ideas such as filling in the Mizubori, the castle site was designated a historic site by Shiga Prefecture, and the interest of caring and maintaining it was built up.
その後、水堀埋め立てなどの意見も出されたが、昭和47年に将軍家宿館遺跡としての価値が評価され、滋賀県の史跡に指定されたのを契機に保存整備への関心が高まった。