This is the Wilcox Mansion. It was here, after the tragic assasination of President McKinley, that Theodore Roosevelt took the oath of office that began his presidency.
From the Theodore Rooevelt Inaugral Site website at WWW.TRSite.org...
On Thursday evening, September 12, Roosevelt and a group of family and friends hiked up Mt. Marcy and spent the night there. Back in Buffalo, McKinley's condition had taken a turn for the worse and he was rapidly deteriorating. During his return from the hike on Friday afternoon, Roosevelt was met by a messenger, who carried the news that McKinley was dying and the Vice President should return to Buffalo as soon as possible.
TR left his cabin in the late evening of Friday, September 13 for the thirty-five mile carriage ride to the nearest train station at North Creek. He arrived there just before dawn and was told of the President's death. He took a train to Albany and another one to Buffalo, arriving there at about 1:30 p.m. McKinley had died at 2:15 that morning, September 14, 1901. His death was attributed to gangrene of both walls of the stomach and pancreas.
Theodore Roosevelt arrived in Buffalo at 1:30 pm. He was met at the train station by Ansley Wilcox. After a visit to the Milburn home to pay his respects to President McKinley's grieving widow, Roosevelt returned to the Wilcox home to be inaugurated. This site was chosen by Roosevelt as the most appropriate place for the ceremony. It took place in the Wilcox library at approximately 3:30 p.m.
A small crowd was assembled, including a number of newspaper reporters, who were allowed to take notes. Photographers were barred from the room until after the ceremony. Because he had been called to Buffalo from an Adirondack vacation, Roosevelt had to borrow formal clothing suitable for the occasion. Federal District Judge John R. Hazel administered the oath. Immediately following the swearing-in, Roosevelt held a brief Cabinet meeting in the library and then proceeded to the morning room to draft his first presidential proclamation.