This has crossed my mind many times. You'd think they could narrow down where she was kept to some extent. A twisty road. Zooming out on the map from where she was dropped, there are a few twisty roads, but how long of a ride was it, approximately? Were they in the vehicle for hours or was it just a short ride until they dropped her off?
As for the place she was kept, was it a house, a house trailer, a pole barn and they just marched her inside to shower, etc.
She saw the bathroom, so was it a modern bathroom or did it have a 70's vibe going on?
Did she have to climb stairs to another level to shower? I understand she kept her head down to 'avoid getting beat' but she surely got to take in her surroundings for some of the time.
Did she feel she was kept in a basement? A finished basement or not? Even blindfolded at most times, she would likely have gotten a feel of how big the place was, how many levels, etc.
If she could feel it was a multi level home, police could cross off their list any single story homes.
What condition was the place in? Was it a nicely kept home or an old shack?
It it had green shag carpet, LE could rule out newer-built homes.
Did she hear traffic, neighbor kids, airplanes overhead frequently, trains going by?
Did it smell like a musty old abandoned place or a lived-in place with Scentsy or candles going making it smell nice. Did it seem like these people took pride in the place, as if it were their home, or did they just throw food wrappers on the floor, things like that.
Did she hear any pets in or around the home? Any children visiting? Any adults visiting?
Did her captors seem to be cooking on-site, meaning there was a working kitchen, or was it an abandoned house and they just brought in take-out food, chips, etc.
If they were feeding her or themselves fast food, did she hear one of them leave to go get it and were they gone for a long time, or did it seem like there were restaurants nearby?
Do most homes in California have basements? I know in some states they aren't common. If she feels she was kept in a basement, and they aren't common, that could narrow down the places.
It's odd, well not for this case, that they haven't given any hints or clues to the public to have their wheels turning about a place in their neighborhood that might have been the holding place.
I realize they don't want to make it look like they need the public to solve this, but as far as we know they haven't gotten it nailed down on their own yet.
Are they even looking for this place?