Chelsea proving grounds

I've never been to Chrysler's famous proving grounds myself, but according to photos there is this very steep hill located there. OK it's a 32% grade according to the sign. Makes sense as they need to simulate stresses their products will face out in the real world. One photo is of the 1966 Hemi Coronet being tested by a magazine editor. An old Popular mechanics article from 1975 shows the "new"1976 Dodge Aspen reaching the top of the same hill. Also I found a picture of a Duster about to descend the same hill.
Anyways with Fiat running the show now, I hope they don't decide to sell off the Chelsea proving grounds to land developers. With computer modeling maybe the proving grounds will be obsolete and they would rather sell out. I would think its part of Chrysler's heritage, that's where a lot of milestone musclecars were tested and approved for production all those years ago.