when was the company founded by philanthropist which  is Sellen Construction client established  
Sellen Construction:  Its clients have included Microsoft, Amazon.com, AT&T, Russell Investments, The Bill and Melinda Gates Foundation, and Vulcan Inc. Vulcan Inc.: Vulcan Inc. is a private company founded by philanthropist and investor Paul Allen. Vulcan Inc.:  It was established in 1986 and oversees Allen's diverse business activities and philanthropic endeavors--from sports teams which include the Seattle Seahawks and the Portland Trail Blazers to conservation projects such as the Great Elephant Census, the Seattle Cinerama, and Museum of Pop Culture.
established in 1986