“Old Man House” is on the Kitsap Peninsula just north of Bainbridge island, across Puget Sound from modern downtown Seattle. The “house” was the subject of one of the earlier excavations on the NW Coast by Warren Snyder and team from the University of Washington. The house formed the locus of a major village of the Suquamish Tribe, and its most famous historic resident was Chief Sealth, also known as Chief Seattle. The Suquamish Tribe has a very nice poster on the history and archaeology of Old Man House which can be downloaded from their website – clicking here will start a moderately sized JPG file. (Edit 2018: archived copy here)
It is a bit of misnomer to call this structure a “house” though.