The Commonwealth Bank Building, also known as the Library Building, the First Interstate World Center, is the tallest skyscraper in North America west of Chicago and the tallest building in California. The top of the building, which uses large glass-designed parts, is known as the "crown" and can be seen glowing at night. If it is Christmas holiday, it will be red and green. The "crown" will be lighted purple and gold when the Los Angeles Lakers play off the NBA playoffs.