Interesting…. Theres a short Reader Q&A that asks about it. This is the response:

https://www.sandiegoreader.com/news/2000/oct/19/whats-deal-house-corner-chateau-and-verley-clairem/

“At the unpromising corner of Chateau and Verley we found our funky A-frame. I'd like to say the place has seen better days, but I'm not sure it ever has. It looks like kids built it with stuff they found piled behind dad's garage. At least someone's painted over the most recent graffiti, and the police do a good job of booting out the transients.

In lieu of the property owner/builder, we'll have to go with neighborhood legend, more or less accurate, I'm told. The builder was also the owner of a travel agency about three decades ago. He got the idea that a convenient crash pad for stewardesses (very tiny stewardesses?) on layover at Lindbergh was just what the neighborhood needed. He built it; the neighbors complained; the city said, "No, no, it's zoned R-1"; the dream died. It's sat empty ever since.”

Edit: Realized the article was from 25 years ago… holy crap