Where is the Palo Alto CARET Laboratory located?
Besides the obvious possibility that no such building exists, I think it is worthwhile to examine again the possibility that it does exist somewhere as described by "Isaac" on his web page. The following are some points about the building that have been brought up separately in the past 3 years:
"Located in Palo Alto"
For completeness: Isaac states 'PACL was located in Palo Alto, but unlike XPARC, it wasn’t at the end of a long road in the middle of a big complex surrounded by rolling hills and trees. PACL was hidden in an office complex
owned entirely by the military but made to look like an unassuming tech company. From the street, all you could see was what appeared to be a normal parking lot with a gate and a guard booth, and a 1-story building
inside with a fictitious name and logo. What wasn’t visible from the street was that behind the very first set of doors was enough armed guards to invade Poland, and 5 additional underground stories.
I'll add my speculation:
Assuming the large number of armed guards wore uniforms, they either changed once inside and would also need a large parking facility and/or nearby accommodation given the urban-city settings or more than likely they were communally stationed/accommodated 'close by' in a military or security-type facility and transferred underground so as to avoid detection. (I would assume these guards did not live underground 24 x 7 for years of classified service.) Reasonably then, they would have been accommodated/stationed at a medium to large size security type facility within say a 5 mile radius of PACL.
Assume also that PACL operated in the early eighties and the underground building complex would have taken at least 5 years of planning and construction to complete the facility. So it might be reasonable to assume the 'surface' details - the office and surrounding structures - are mid-70's style, with completed construction, certification etc around that timeframe.
The land may once have been owned by the government and sold off in the late sixties or early seventies for commerical 'development', one of these developers being owned by an intelligence front.