Here's a blurb about it from Wiki:
In his program, Huell noted that he initially mistook the Hacienda for the Mission San Antonio de Padua, which is about a mile further up the road. This apparently happened quite often with first-time visitors looking for the Mission, so the golden Moorish dome was meant to signal, hey - this here ain't no Catholic mission! We didn't stop at the Hacienda on this particular trip (8/10/17) since we were en route to see the mission, but I've earmarked this location for a future more in-depth visit or perhaps even an overnight stay.
Location: 101 Infantry Road, Jolon, CA 93928
From Paso Robles, head north on Hwy. 101 for 20 miles and exit Jolon Road (G18) and head west towards Fort Hunter Liggett. Continue another 20 miles (along which G18 will eventually turn into G14) and then turn left on Mission Road. Continue another 5.7 miles and then turn right to Hearst Hacienda Courtyard.
Contact: Tel (831)386-2900
Rooms (rates from website as of 10/10/17):