2. Mercer Island Estate
Immense love for the native land made Paul Allen spent billions and acquired a property in Seattle. He has an enormous beachfront residence in the outskirts of Seattle, which is spread over an area of ten acres. The mansion is built over the area measuring 10,000-square feet and shares the marvelous view sight of Lake Washington.
The mansion consists of 25 huge bedrooms, 28 bathrooms, a fully geared- up gym, and several other sumptuous facilities. The house is also known for the large catamaran, which is used by Paul as a waterfront concert hall and a floating helipad. Frequent renovations in the house have made it a little difficult to measure its exact value, however, many people estimate that the house’s price is approximately $20 million.