and it shows that it is registered as a historical building.
A Tradition of Sound Advice
In looking at the National Register of Historic Places in San Diego County, California, it says it is not.
You can contact the San Diego Historical Society at http://www.sandiegohistory.org/ and perhaps they can help.
Best of luck with the namesake hotel,
Mark & Kari Shea
Shea Real Estate
National Association of Realtors
CA DRE License 01713506