San Jose, Florida

'General Plan Showing the Proposed Layout for a New Community on the St. John's River at Jacksonville', 1925 in the John Nolen papers at Cornell University, available in glorious fine-grain detail here.

 These are the the reserves I've uncovered with my eagle eye:

 This is where this site was planned to be but it was not created in this way.

This section of San Jose is so completely redesigned that I can't even tell where this would have been, had it been created.

 This area is here and has been completely redesigned from Nolen's original.

These are, I think, in this general vicinity but the open space doesn't seem to fit the space Nolen planned. The northern section has been replanned.