bill gates's house is about 6km sq. with the worlds biggest aquarium tank inside.
he has 200 houses
Postal Address is: Bill Gates Microsoft Cooperation One Microsoft WayRedmond, WA 98052- 6399USA
1,987,143,709
There is a site named BillionaireMailingList.com that has all the United States Billionaires Home Addresses. I've used it and have received responses. It also has millions of other links for them.