Among the modernists it's kind of the holy grail. There are four textile houses in LA and one of them, the Millard house, sold for a mere $1.6m in 2011. It was funny - there was an article on the Gettys in the New York Times with a picture of them in their living room and I fuckin' recognized the brick. The Henderson House is a cool million if you wanna live in Elmhurst, IL.
Oh yeah, I know the importance of an actual FLW house. I just had never heard of this one so $23 million sounded high. My mom raised me on his architecture as the epitome of awesome so I'm totally a Kool-aid drinker. There are just a ton of random prairie style houses of his out there and I assumed this was one of them when it's actually really cool. But if the roof of it leaks I wouldn't be surprised