Eagle Rock Park Clubhouse / Neutra

 Eagle Rock Park Clubhouse (1954) by Richard Neutra

Photo: Julius Shulman, Getty Research Institute

The three walls to the right open.

See

Photo: Julius Shulman, Getty Research Institute

Photo: Julius Shulman, Getty Research Institute

Like many Neutra projects, the reflecting pool is now gone (see here and here). 

Photo: Julius Shulman, Getty Research Institute

There's the eagle rock during construction.

Photo: Julius Shulman, Getty Research Institute