It's grown significantly, and moved around, but they finally found a wonderful home several years back at the Paramount Ranch, which is where a lot of TV shows and movies have been filmed (most notably, perhaps, Dr. Quinn, Medicine Woman). In addition to the gorgeous local in the middle of the forest, there's a Western village built there for use in filming, which is far more substantially built than most movie sets.
Or was, I should say. I was looking at a map of the Woolsey wildfire last night, and Paramount Ranch looks smack in the middle of it. I have friends who live reasonably close by, but on the outskirts enough that at last report their home was fine, though they had to get evacuated, and a neighbor only a street away lost their home.
But I can't imagine Paramount Ranch surviving. Beyond it being all wood, it looks to be at Ground Zero.
I have no idea if they're rebuild. On the one hand, there isn't all that much to build, it's just a collection of a random structures of a Western town that aren't much more then shell. And it's a great site for location filming. On the other hand, since so much of the woods around it will be destroyed, the environs won't be as lush. It will come back -- when I worked at Will Rogers State Historic Park, and the Topanga Fire burned much of the grounds (though the ranch house and barn and other facilities were save), the greenery was back within a year. Not as thick and vibrant, but there was a foundation -- though not immediately. And I don't know if there's enough filming to justify it.
May the winds die down soon and bring the fires to an end.