Re: Property Line boundary
Your question presumes (incorrectly) that you have ownership of the land. If the area bounded by the fence is your neighbor's land (per assessor), then you can only obtain title by specific statutory procedures (or by grant, which clearly is not at issue here). The procedure is called adverse possession, and one of the requirements is that you pay property taxes on the land at issue. In early times of the settlement of this country, and even after the Spanish land grants in California, it was possible to pay the property taxes of a parcel like this. But nowadays, with formalized records, title plants, assessor's maps, generally clear legal descriptions, and computerized documents, it is very difficult to pay property taxes on someone else's land without them knowing it.
In short, if you have not paid the property taxes on your neighbor's land (at least the disputed portion), then you do not have ownership by adverse possession.
At best, you have earned an easement. But you cannot have exclusive possession of the property, because by definition, an exclusive easement is tantamount to ownership of the property. California does not recognize such a result.
For more information, or in the event of litigation, seek out a qualified real estate attorney with experience litigating easements. We have several attorneys with such experience. Feel free to call or email.