While $1.4m isn't a huge sum of money for an LA-area house, Topanga really is a very white area. It's kind of a strange place. Very hilly, and the place has a 1960s hippy vibe to it. The main "downtown" area is actually kinda charming to visit, and there are some decent hiking trails there, as well. Totally doesn't feel like the LA area when you're there.
It's a little bit northeast of Malibu.
The "Topanga" character on "Boy Meets World" was named after the town, and in fact the character was supposed to be an eccentric hippy type, much like the town itself.
Lots of 1990s teen boys had a huge thing for her, but I was already well into adulthood by then, so I didn't really take notice of her, other than reading younger guys online talking about her. I also didn't ever watch the show.