Columbia subject headings:
Architecture--Conservation and restoration--Illinois--Chicago.
Manhattan Building (Chicago, Ill.)
Marquette Building (Chicago, Ill.)
Monadnock Building (Chicago, Ill.)
Office buildings--Conservation and restoration--Illinois--Chicago.
Office buildings--Remodeling for other use--Illinois--Chicago.
Old Colony Building (Chicago, Ill.)
Harvard subject headings:
Chicago (Ill.)--Buildings, structures, etc.
Chicago (Ill.)--Buildings, structures, etc.--Conservation and restoration.
Historic buildings--Conservation and restoration--Illinois.
Loop (Chicago, Ill.)
Office buildings--Conservation and restoration--Illinois--Chicago.
Princeton subject headings:
Architecture--Illinois--Chicago--Conservation and restoration.
Buildings--Repair and reconstruction.
Chicago (Ill.)--Buildings, structures, etc.--Conservation and restoration.
Historic buildings--Illinois--Chicago--Conservation and restoration.