Having never heard of Robia LaMorte, I figured I better look her up. Unfortunately, the imdb didn't have a photo. Also, between the TV guest appearances and movies, there's nothing listed more recent than 2001.
I'd say that the Old House is being done elsewhere - there's no way they could pack that material and Collinwood's scenes into less than a week of shooting. It's impossible.
I've no problem with Greystone per se; it's certainly got the right look -- although I really hope they don't go the route of just using a different section to represent the Old House. That was a terrible, transparent maneuver in the 91 series that really destroyed credibility in the setting.
TBH, I think we might even see a tower - that'd be very easy to add digitally. Thinking of it, there are lots of nifty digital fixes they could do... There's a walkway on the house that overlooks the vista of Los Angeles that they avoided showing in 1991 for obvious reasons - how amazing would that look with a cliff and the Atlantic dropped in?
I really hope they don't go the route of just using a different section to represent the Old House. That was a terrible, transparent maneuver in the 91 series that really destroyed credibility in the setting.
I hope they'll work on the angles, lighting, etc., so the place doesn't scream CALIFORNIA! so blatantly.