The owner of an Edo-era ninja house in Hirosaki City, Aomori, is looking to sell their traditional home. Ideally, the owner would like to find a buyer who wants to preserve the historic home. If not, they may have to demolish it due to the high cost of maintenance. 

Some of the features of the house include a hidden compartment between the parlor and bedroom, allowing enough space for someone to hide, along with nightingale floors that are intentionally designed to make a chirping sound when walked upon, alerting occupants of any intruders.

The ninja industry went into decline after the end of the Edo period, but a particular group in the Hirosaki Domain continued long after. Ninjas had been stationed in this district to protect the north from Russian boats that were arriving in Yezo. 

Historic ninja houses are becoming increasingly rare.

The To-o Nippo Press, September 8, 2019. 
The Hirosaki Keizai Shimbun, November 16, 2018.