Here is an older contemporary article about the original Philadelphia assembly plant. I had looked for the location for a while on maps and things without too much luck...but apparently never knew that the locals actually called it the 'Botany 500' Building.
No reason for posting other than to save the link for someone who later may try to find the buildings and not know it is/was actually called something else. I would have never guessed a Kahn building to be triangular in design.
I also notice the article states that the Philadelphia Assembly branch did 150 cars a day at a point. Also making 40,000 doughboy helmets in WW1.