Modjeska’s home survived!
I got a reply from one of the Rangers at the Orange County parks department:
Fortunately the firefighters were able to spray fire retardant foam on the majority of the buildings in the canyon, and I am happy to report that the house and outbuildings are still standing. The meadow, as a clearing, provided a good amount of protection, as well. The grounds at Arden look remarkably good.
Minor I know, compared to the massive losses people have experienced down there, but very cool just the same.
I posted about my last visit to Modjeska and I recently updated and tagged some of my images from that trip on Flickr.