George Fred Keck's Sloan House is for sale.
The house, commissioned by Howard Sloan and built in 1940, is of major historical significance. It is, strictly speaking, the first solar house---the first to be given that label and promoted as such. It was the first house in the development that Sloan called Solar Park. It was also the first example of an architect calculating passive solar gains, calculating the losses, and determining the savings. The Sloan House is discussed in great detail in The Solar House.
Here's a link to the sales website: link