Quoted from MrBally:
Yes, that is the Bally Belmont plant & General offices. It always was a manufacturing facility. It was added on to the East in 1968. It was vacated by Bally in 1983 becoming Moloney Coachbuilders for a few years before being demolished to make way for Townhouse & Condo development.
Here are a few photos from 1989 with the building renamed Moloney Coachbuilders. Yes, the grandson of Bally's founder, Ray Moloney, had a limousine, shuttle bus, ambulance and fire rescue manufacturing business and located it in the Bally building after Bally moved their plants to the Chicago suburbs and their headquarters at 8700 W. Bryn Mawr Avenue.
At first (around 1985) Just the Bally logo was removed and the sign said "Moloney Manufacturing Corporation". Unfortunately, I did not take any photos of that signage.
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Added over 4 years ago: In the top photo, which is looking North on Washtenaw, you can see the Henry Grebe shipyard which was just North of Bally's property.
All of this is gone and part of the townhomes that went up on the former Bally site. Ironically, the original name of the townhomes were marketed as "The Boatyard". I thought a tribute to Bally would have been more appropriate.
The WMS/Scientific Games employee parking lot (entry is on Roscoe/Hon. Louis J. Nicastro Way) abuts the Townhomes.