What is the oldest building in Chicago?
Henry B. Clarke House
In 1977, the City of Chicago purchased the house and moved it to its current location, a project that included lifting the entire building over the L tracks on the Englewood-Jackson Park line.[4]  It was a cold December night and the hydraulic equipment responsible for supporting the house froze.  For two weeks, the house sat adjacent to the El tracks until it could be moved to its current home at 1827 S. Indiana.