Great report and piks
We were there at roughly the same time, a local man arrived on scene and told us a bit about the place , he used to play in it when he was about 10 and said you could go in the basements then and it was full of hundreds of light bulbs and slowly over the years the elements and people have take stuff from it till it stands in its present shell like status.
He showed us that knobbly tree too, i took almost the same pik
theres something like an American redwood to the north of the estate its 41 feet round HUGE!! apparently in its day it had a plant from everywhere in the world in the gardens and greenhouses.
We went there , one of the hotels you covered (found by pure chance on a lane to Red Wharf Bay), the brick pottery remains and the climax of our mini Abandoned in Wales tour...Denbigh.
Bad news was my 32gig card corrupted and lost all my images B=st--d .
Ah well , good time tho.