Here's the kilns from Henry Charlton Beck's time (circa 1920-1935.) From
Forgotten Towns of Southern New Jersey.
You can see how much has deteriorated over the years. In Beck's time the kilns all had their roofs intact, and the brick archway that frames the photograph is still standing. Keep in mind, though, that the factory had only been abandoned since 1915, meaning that the ruins were anywhere from 5-20 years old at the time this photograph was taken.
Also note that Beck totally got his wires crossed. The real Pasadena Terra Cotta Company is located up the road on private property.
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