The Seattle Art Museum shows off its expansion plans. “SAM’s downtown expansion is a unique, mutually beneficial partnership with Washington Mutual Bank that allows the museum to expand incrementally into its new 300,000-square-foot space. In the first phase, SAM will occupy about 95,000 square feet. The bank will lease the unused upper floors from the museum, allowing it to amortize the financing of the $63 million expansion. When SAM fully occupies its new building, it will triple its current size to 450,000 square feet.”