The Bost Building, also known as Columbia Hotel, is located on East Eighth Avenue (PA 837) in Homestead, Pennsylvania, United States.

[4][6] After some use as a rooming house and hotel, today it serves as the headquarters and visitor center for the Rivers of Steel National Heritage Area.

It is three stories high, faced in brick laid in common bond, resting on a stone foundation and topped with a flat asphalt roof.

[6] Bands of stone run along the slightly skewed south (front) facade at the tops of all six windows on the upper stories, forming lintels to complement the similar sills.

Deputy sheriffs and Pinkerton men taken captive during some of the violent confrontations were held at the Bost Building to protect them from retribution.