However, I called Chase bank and asked about opening an escrow account and they said I would have to have some kind of agreement.  

My question: is it legal rent the ADU under a lease agreement?  

Until you have experience in partnering with others on successful projects, I highly recommend working with your partner and an attorney to structure an appropriate, legal, and viable operating agreement, be it in context of an LLC or otherwise. 

Is there any way we can amend our operating agreement/LLC structure in order to anonymize our addresses?

@Amby BhagtaniGet an attorney involved - let them review the agreements and advise you on the next steps

Number of occupants at the property vs how many tenants are on the lease agreement.2.

Hi  - I should have clarified - when my tenant was in this situation I was very upfront with her that over the course of the year it would net out to an increase in the rent (2 payments worth) and wrote an addendum to the contract/lease agreement that I had her sign acknowledging that she was aware of this and the biweekly payment terms. 

I expect a property lease agreement between each child series and the operating/management company (also as a child series) is just as sufficient as two separate LLCs making the same property lease agreement.My only goal is asset protection so I need to know if this approach will immediately "pierce the veil."

OMG THANK YOU THIS IS HELPFUL ALSO, the top left hand corner of that agreement says “valid until” - does this mean anything done after that date was done without consent?

Consult with a tax advisor for specific advice.Transition to Primary ResidenceLease Agreements: When renting out the property, consider the timing of lease agreements to align with your future move-in plans.