when was the company founded by philanthropist which  is Sellen Construction client established
Sellen Construction Sellen Construction is a Seattle, Washington-based construction firm. It is the largest commercial construction firm in the Pacific Northwest. Its clients have included Microsoft, Amazon.com, AT&T, Russell Investments, The Bill and Melinda Gates Foundation, and Vulcan Inc.
Albert H. Small Albert H. Small (born 1927) is a real estate developer, and philanthropist.