Empty lot North of Arena and Adelaide

Does anyone know what used to be in the empty lot just north of Adelaide and Arena streets, on the west side of the creek across from the fire station?

I've lived in the area for decades, and always wondered what used to be on this property. This lot has always been gated off at the entrance on Adelaide near the fire station... Occasionally film crews will use the empty lot, other than that it always seems vacant... Anyone know what it used to be?