Diverse Agricultural 10 acre minimum.
A lot can be done there, Best way to find the rules is to go to the Sonoma County PRMD web sight, and then go to Zoning. If you have the APN # you can even look up that particular property.
NOTE: the description of the number function is at the bottom of the page.
If you'd like to work with a broker-agent who is a country property specialist give me a call
I will echo the others in that DA 10 refers to Diverse Ag zoning with a ten acre minimum lot size for that parcel. Good luck in your research!
If you go to the Sonoma County Department of Permit and Resource Management and drill down into the Zoning section you will find a bit more info. Basically, DA 10 means the zoning for that particular parcel would permit one dwelling unit per 10 acres. It's very rare to find parcels that can be split but if the land you are looking at has at least 20 acres, it's possible that you might be able to split it into two parcels. Again, land that can be split is almost impossible to find today. The best way to get specific info about the parcel is to call PRMD and ask to speak to someone in Zoning. They will be able to answer your questions if you can provide the APN (Assessor's Parcel Number.) if you want more info on land in Sonoma County you can contact me, of course. Would love to chat with you...I specialize in land sales.