Solution Idea: Manhattan School/Park

[AlchemistQ]

NOTE: I also believe that Manhattan Park is the final hiding place because of the image clue containing the sign that says "A is for Apple". I believe that this is supposed to refer to grade school. And guess what was at Manhattan Park in the 1980s? Manhattan School!

[diceycat]

For the most part I like the theory. Always a possibility,Worth a visit by a local.