What you are looking at is the legal description of the parcel. You should look at the grantee information instead. Likely it describes each party as having an undivided 25 percent interest in the property.
You should call one or more commercial brokers in the area to get comparable sales and listings to estimate the value of the property. Let them know there is an interest in selling. If it's worth anything, perhaps they can convince the other three parties to sell. Otherwise, they can ask the other three parties to buy them out.
If they cannot sell the property for the assessed value and they are stuck with the property, they should file a "request for review" with the assessor's office. Any comparable listings or sales in the area or that offer they received can be used as evidence. At least they can get the taxes reduced. If the assessor does not respond by July 1st, they can file an assessment appeal. Lancaster is in LA County IIRC.
Here is the land commercial brokers have for sale in Lancaster:
https://www.loopnet.com/california/lancaster_land-for-sale/Without more detail, I can't narrow the market down except by lot size.
Bottom line, asking prices for land in Lancaster might support selling the property, but you need more information.