I couldn't figure out how to cut and paste the article that I found regarding Link Belt Co.'s purchase of the property on Pershing Rd, so I'll summarize.
This was in the Chicago Tribune Aug. 6, 1914.
Link Belt Co. Buys City Block - pays $95,000 for property bounded by Stewart and Princeton and 38th and 39th sts. The property was acquired from Bernhard Rosenberg and Maurice Rosenfeld et al. The entire property was originally purchased by the Rosenfeld and Rosenberg families in 1854. The property was at one time occupied by a ball park by the American league baseball club.
Then in 1920, Link-Belt began construction of a $320,000 administration building adjoining the plant.
So, it appears that it was definitely always a manufacturing plant at that location.