Legal Question in Business Law in California

You can only lien a property for the value of work and materials incorporated into a work of improvement on THAT property, so if you did work on two properties in completely separate counties, of course you must file two mechanics liens, and they must be for the value bestowed on the respective properties, not the total amount due.

I agree; any lien must be recorded in the county where the work was done, and the lien recorded in County X must not include amounts due for work done in County Y. If and when the cases come up for trial, if there are a lot of facts in common such as a single contract and a single owner/defendant, the judges in the two counties may allow consolidation of the cases so you only have to go to trial once, in one county.