Interesting. Looks like the main one in the article was build circa 2005. The second one in the article looks like it was inspired by the second one mentioned i

Interesting. Looks like the main one in the article was build circa 2005. The second one in the article looks like it was inspired by the second one mentioned in the article, which dates to circa 1965 in Arizona. The Mushroom House in San Diego dates to circa 1965 as well. I'm inclined to suspect that the San Diego Mushroom House was built that way not out of fashion but rather out of necessity. It's build directly on the shoreline, even where the ocean can get up to. Elevating it on a concrete pile probably was a form-follows-function thing (guess). It's actually a guest house and was built with a custom tramway that traversed the cliff up to the main residence.