If you are looking for an agent in the Inland Empire dealing primarily with land contact Jerry Noe with Keller Williams Riverside, he is part of the Robillard team they are one of the top teams dealing with Land in the area. https://www.riversidemarketcenter.com/agent/Jerry%20Noe/9268df09-c452-4b6d-bec7-4d5773188aed/ 

I would say you first need to decide if you're going beach or inland like Disney.

as in land developers for creating building lots  ? 

Since it is zoned ag, have you tried contacting any lenders that specialize in land and farm loans?

@Ryan ZimmermanHere are my favorite books:Multifamily Millions by Dave LindahlThe ABCs of Real Estate Investing by Ken McElroyThe Complete Guide to Buying and Selling Apartment Buildings by Steve BergesCommercial Real Estate Investing by Dolf De RoosTrump: The Best Real Estate Advice I Ever Received by Donald TrumpTax Free Wealth by Tom WheelwrightCommercial Real Estate 101: How Small Investors Can Get Started and Make It Big by David LindahlRaising Private Capital: Building Your Real Estate Empire Using Other People’s Money by Matt FairclothThe Definitive Guide to Apartment Marketing by Josh GrilloInvesting in Apartment Building by Matthew MartinezCrushing It in Apartments and Commercial Real Estate by Brian H MurrayThe 7 Secrets to Successful Apartment Leasing by Eric Cumley2 Years to a Million in Real Estate by Matthew MartinezBurn Zones: Playing Life’s Bad Hands by Jorge NewberyCommercial Mortgages 101: Everything You Need to Know to Create a Winning Loan Request by Michael ReinhardIt’s a Whole New Business!

Many many people or entities can have rights in a property that are not recorded in land records.

You get tax-deferral and asset protection benefits while you continue growing the real estate empire.

The two of them have created a mini empire with STR's, so you know their advice is rock solid.Good luck, and let us know how you do!

As of now looking at Pasadena and the Inland Empire.

Someone who has a track record of owning properties in the location and can direct you towards your goals for your empire accordingly based on their actual time and energy invested to build theirs.I work and broker with over 10,000 agents across the United States using the highest measure of scrutiny and standards for their clients.