I understand that at a minimum, I HAVE to register in CA since that's where the property is, but the lawyer is indicating that NV's a friendlier environment for Landlords so I should register in NV and just "do business" in CA.My questions are:  Is there a material benefit to registering in NV and then also CA? 

The profit will be taxed at my personal tax rate.What's the benefit of having an LLC to do flip?

Making your unit ADA accessible can offer several benefits, including a larger tenant pool, potential for higher rents, and future-proofing against regulatory changes.

Or, if possible, move into a different property, hold onto this property for another 2 years or so, (your circumstances have now changed) and you'd like to sell your investment property, 1031 all proceeds into a "like-kind" property and benefit from the 1031 tax deferral. 

Eliminating any possible benefit of the trust.

The reason I say could is because your current income, tax situation, and real estate investments can dictate if buying real estate might benefit you.

@Dan N.These types of strategies is like building a conveyer belt between your home and your neighbors in order to borrow sugar from your neighbor instead of just walking there, knocking on the door and ask for sugar.Making these overly complex strategies for real estate really adds zero benefit and just costs you extra money in the long run.May I ask why you need such a complex structure ?

If you're just seeking an agent for flips, then I'd check out Premier Point Realty & Homestead both heavily equipped with experienced agents and many who are seasoned investors themselves which comes with its own benefits. 

We will inevitably work with a CPA in the future, but are there benefits to starting that relationship now?  

Moreover, you have much higher overhead than most experienced investors.In a REIT you are missing out on all the tax benefits.