It appears that they sold one of the buildings. https://www.hemmings.com/blog/2017/12/13/kanter-auto-products-on-the-move/
The big reason is probably... time.There used to be an outfit, owned by a couple of brothers... around Northern New Jersey, that specialized in suspension and steering parts for old.. and really old .. cars. I think that they moved to Arizona, later. Even later, they seemed to have disappeared. I can't recall their last name. Anyway, I have to wonder about their huge inventory of valuable parts.....