Check out the all new POLTERGEIST III location page at SET-JETTER.COM
While certainly a fan of the original Poltergeist (see locations here) and somewhat of Poltergeist II (locations here and here), the third entry was a bit of a letdown, plus it had an even darker cloud over it with the death of its lead actress, Heather O'Rourke. I do give them kudos to try to do this one without any optical effects, some working better than others. The film was shot in Chicago and although I had been to the Hancock Tower before, I didn't track down any other locations until my latest visit.
First up is the high school....
Screenshots....
Finding Carol Anne's school was a bit of a tough find, since it's not even a school and there was essentially just a couple shots to use as reference, but I figured it out!
Screenshots....
And finally the tower itself, pictures taken on a earlier visit...
Screenshots....
Actress Nancy Allen as Aunt Pat....
And visiting Heather O'Rourke.....