In what year was the historic house located adjacent to the summit building built?
Tip-Top House: The Tip-Top House is a historic former hotel in Mount Washington State Park in Sargent's Purchase, New Hampshire, United States. Tip-Top House:  Built in 1853, it is the oldest surviving building in the summit area of Mount Washington, and is believed by the state to be the oldest extant mountain-top hostelry in the world. Mount Washington State Park:  The historic Tip Top House is located adjacent to the summit building and is open (small fee) to visitors from early May to early October.
1853