It is also the law in California; However, this property is an exception because it was given to the previous owners by the Mexican government before California became part of the United States.
Makes it a lot harder to deal with.
As a former Coastal Commission staff member in the 1980s,
I've seen this scenario played out over and over. The so-called
issue of Spanish land grants pre-existing and somehow
superceding laws like the Coastal Act isn't an issue at
all -- land grants occurred in the early 1800s all over
California, so Martins Beach isn't any special or privileged
circumstance.
[1] http://blogs.kqed.org/science/audio/silicon-valley-billionai...