[Cob] Class K in Mendocino County

[Scott Race]

I was reading up on Mendocino County's building codes on their website
(http://www.co.mendocino.ca.us/planning/PermitPlace/PermitPlace1.htm).  I
stumbled upon this passage...I was wondering if anyone knew about Class K?
It appears to vaguely allow for natural building, but I'm not sure if I'm
interpreting it correctly.  If it is, what does it meaned that the property
has to be zoned for Class K?

The passage:
What is Class K?

Class K is a relaxed construction standard available to owner-built rural
dwellings and appurtenant structures intended ".to allow and facilitate the
use of alternatives to the specifications prescribed by the Uniform
technical codes to the extent that a reasonable degree of health and safety
is provided." To qualify, the property must be zoned for a one acre minimum
Class K or Uniform Building Code structure.