The past few years there have been many archeological diggings that have uncovered many relics related to Gifu Castle, Nobunaga, and Saito Dosan. One recent discovery was part of a mansion that was burned by Nobunaga when he attacked and conquered Inoguchi (Gifu) in 1567.
When Nobunaga made his final assault to take over Mino for good in 1567, he burned the castle town and soon Inabayama Castle (Gifu Castle) became a naked castle. You can find the conquest of Mino in the Shincho-Ko ki. According to the findings, the discovered site was not a townhouse, but a warriors mansion. Also the mansion was built during Saito Dosan's reign.
This is good news and I plan to visit the archeological site later this year. Here are two links that covered the story.
Nobunaga no tame!