It looks just like a typical office building on the east-side of the street, between 14 Mile and Maple Road.

Web searches for that address yielded references to GM Onstar.

If you travel that route on your daily commute, or seen it somehow, you will notice the 2 barricades for the only 2 ways to enter and exit the compound. Everywhere else surrounding its periphery is "guarded" by large rocks/boulders.

Does anyone know anything more regarding the reason[[s) behind the secrecy or mystery of such an arrangement ?