The Phoenix Mutual Life Insurance Building is considered by architectural critics to be an excellent example of International Style design. The “Boat Building” was constructed in 1963 by architects Harrison & Abramovitz and is part of Constitution Plaza.
The architects gave the building a unique shape to reduce the total of surface area. The shape is technically known as a lenticular hyperboloid.
The building consists of alternating patterns of green glass. The first floor is recessed and is surrounded by a sunken walled courtyard.
The building is listed on the National Register of Historic Places and in 2010 was awarded Silver LEED (Leaders in Energy and Environmental Design) certification from the U.S. Green Building Council.