Some large downtown offices seem to have better modern art than the Seattle Art Museum. From what I have seen, it appears that they have carefully selected work that will appreciate in value, over the next century or so; do they expect to last so long? But perhaps the SAM Rental/Sales Gallery http://www.seattleartmuseum.org/visit/visitRSG.asp helps them by letting them rent art, to see if it is a good fit for their offices before they buy it. SAM features work from other galleries, more than a couple dozen artists, and claims to have access to over 1000 pieces of art. I would recommend this as a decent place to find art as a long term investment because artists who sell works here will probably have work in the corporate collections that may be famous in another century, and not all of them are charging the prices of high-end galleries yet.