Speaking personally, I don’t like the white house in Phoenix. It looks like an alien spaceship set plonked on a desert lot for a high concept, low budget SF film of the late 60s to early 70s. I wouldn’t buy it.
I wouldn’t buy the Scottish home either. It reminds me of cheap, local authority built schools, the kind which are now plagued with a variety of maintenance issues. The inside looks awesome, though. Great job on the redesign!
I don’t know how important they are to preserve for architectural heritage purposes. It seems a pity for something unusual to be razed and replaced, especially when you don’t know what’s going to replace it. Things have to be considered within their environment, which includes the culture they are part of. As Brit, I’m used to a very different scene than a lot of the US.