What is County or City creteria in Socal for splitting a Industrial lot with 2 bldgs into two separate lots?

contact the county or city that has jurisdiction over the property. they will give you the criteria for minimum requirments like zoning, land use, setbacks, access, etc. the process may be easy or may require legal assistance. The property will have to be surveyed, a request submitted to the governing body-planning/zoning department. http://www.csac.counties.org/county-websites-profile-information

You have gotten good advice. I bought a non-conforming lot. It became its own lot because someone stopped paying on their mortgage and the owner's home got a IRS tax lien on it. I found in my county's ordinance that if a lot has to be split due to government action, then an exception can apply. I hired three lawyers and spoke with many people in the government....no one came up with that information...my recommendation is not only to hire the best lawyer but read for your ordinance for your
self...