[Velveeta]

The "Sangamon Street Building" at 115 S Sangamon is not that big:

[BIOCHEMKY]

See http://www.cityofchicago.org and then search for “Demolition List 2008”

The building in which the office that Bill Ayers and Barack Obama shared exists is scheduled for demolition by the Planning & Development Dept. of the City of Chicago to make room for a new public park.

Demolition Hold List (2008)

#100252187
Date received: 9/5/08

Address: 115 S. Sangamon
Ward: 2nd
Applicant: Midwest Wrecking
Owner: Chicago Park District
Permit Description: Wreck and remove a 1, 2 and 5-story brick institutional building. Salvage select brick and decorative elements for reuse on site. [as part of city park #542, Sangamon/Adams, to be built on site]

[justiceseeker93]

Is the chimney part of the building or part of another building behind it?

The building itself looks maybe 100 years old. Could have been a factory at one time.