Still, it is obviously a historic place, and not just because the famous exterior remains (as do the mantelpieces, chandeliers, and paneling that were later reinstalled).
This is a historic building which goes beyond the exterior. 
mnli hypothesis: This is a historic building which goes beyond the exterior.  premise: Still, it is obviously a historic place, and not just because the famous exterior remains (as do the mantelpieces, chandeliers, and paneling that were later reinstalled).