Some of the interior passage doors weigh over 800 lbs, but are balanced for easy use. Accoustics are a concern throughout. Various woods and fabrics are being used. Accoustic panels in the ballroom move out of sight on their own. Roofing is stainless steel.
Floor is heated everywhere including the driveway and walks.
Ventilation system also conditions the air for health and comfort. Hidden cameras everywhere including interior stone walls. Sensors in the floor can track a person to within 6 inches. System is monitored at the Microsoft campus. Gates has a personal 4-car garage.