This fabulous landmark is a must have for an exclusive few who recognize the city setting as their playground and deserve to own a piece of the sky. Feel the comfort, and convenience of the present, while experiencing the fine lines, architectural detail, and quality craftsmanship of the past. Rich in history The Classen will gladden hearts from days gone past. Originally constructed in the style of Frank Lloyd Wright in 1966, The Classen is a gold-colored, 21-story hexagon marvel. All clad is glass, marble, aluminum towering in the Oklahoma City sky.