[Cadaverous Pallor]

Bad news, €.

Information published in 1962 suggests that the old castle was on its last legs:

“Weeds, brush, and neighborhood vandals took their toll of the rambling structure. Even the tiled swimming pool on the hilltop above fell into disrepair. Eventually teenagers [shudder] discovered the house. Their wild parties brought the wrath of both neighbors and police.”

Darrell Gregory, a 28-year old studio policeman, purchased the property in 1958, and “his quick handling of the continuing juvenile invasions earned the admiration of the neighbors”. Unfortunately, his grateful neighbors’ earlier complaints had attracted the attention of the Los Angeles Department of Building and Safety. In response to LADB&S demands, Gregory “tore down most of the outside house, most of the terrace walls, the archway and a utility porch as ordered.” He was granted a delay during which he worked desperately to meet the inspectors’ demands, but ultimately the decision was handed down to raze the house. To make matters worse, the “road below, over which McDermott had brought building supplies, had long since been abandoned and sold to neighbors”. Gregory’s home was landlocked. Even with help from neighbors, perhaps guilt-ridden neighbors, Gregory was unable to bring the building up to code. During a series of inspections, delays, and more inspections, the city passed an ordinance that would prevent division of property in such a way as to deprive a landowner of access. This “Spiderpool” ordnance was too late to help Mr. Gregory. The final decision came in the fall of 1962. Gregory abandoned the property and not long afterwards the house and pool were bulldozed.

Even if part of it still exists, it's locked away from public streets.