This is one of two office buildings at Valley River Center that look like they are upside down.
Valley River Center is Eugene's major shopping center. According to Wikipedia -

"Valley River Center is a super-regional-class shopping mall located in Eugene, Oregon, U.S. It is the largest shopping center between Portland and San Francisco with over 130 local and national stores and restaurants. Located on the banks of the Willamette River, the mall is easily accessible by bike and walking paths. Also located near the mall is the Valley River Inn."