When Char was originally forming the organization one of his first priorities was to find somewhere large enough and obscure enough to store the large amounts of contraband needed to get the organization off its feet.  He found out about such a place from a skiing acquaintance.  The acquaintance had worked as a marine photographer and while exploring the coastline he discovered an underwater cave that led to an enormous cavern.   Char explored the site for himself and found it to be exactly what he was looking for.  He bought the land above and much of the land surrounding.  Then he and Scott widened the entrance to allow for a small cargo submarine and put a camouflaged tarp over the entrance to hide it from curious divers.   A small construction crew was hired for a hefty fee, (you have to pay a lot to get workers to go to and from work blindfolded) and work was begun in earnest.  The cavern was expanded, support columns erected, and large generators brought in, a small two story medical center, a stockade, a shooting range and the main security station were installed.  While this was being done the house itself was being built above ground.  The entire process took 3 years and when it was done Char had a home that was a virtual fortress.  The house itself while being huge, looks perfectly normal.  The cavern is only accessible by Autumn Blades inner inner circle, heads of staff and a few trusted security personnel.  With the exception of the security area and the medical center, for the most part the cavern is used as a warehouse, shipments are transported to and from by submarine.   The caves intersect and branch off and if you don't know exactly where you are going it almost impossible to navigate.  The house elevator will also transport you to the cavern (if you know and punch in the right code) and there are several hollow support columns which provide emergency escape routes from the mansion to the cavern.   Char owns the land surrounding the house for ten miles in every direction, the estate has incredibly tight security both on land and in the water, and tight radar surveillance monitors the skies above.  The security was designed to stop single persons or small teams from gaining entrance and so far only Jacques Dubois has been successful in besting the security.  Subsequently the gaps in the system which allowed his entrance have been filled at his advising.   Nothing short of a full scale assault will penetrate the estate now, making this the only place where the Inner Circle and trusted others can truly relax.  The house itself is located outside of Night city on a wooded area of the coast.