. . . you have to read this opinion of the Clifornia Court of Appeal in which some poor guy tried to build two houses on his 10,000 sq. ft. lot. If nothing else, you just have to read the Byzantine chronology for yourself to believe what went on in this case. Suffice it to say that the permit-seeking process began in the 1990s, and has gone on for 20 years! And the holding of this decision, filed today, is that the case is still not ripe. The case is Mahon v. County of San Mateo, Cal. Ct, App., 1st District/Division One, March 5, 2018 The opinion is unpublished, which means that you can’t cite it in California courts as an authority.
So if you are a land use/taking junkie, have at it:
http://www.courts.ca.gov/opinions/nonpub/A149633.PDF