The LLC pays down the Loan over time so C gets interest and return of principal, and A & B get benefit of controlling more property than they could without C's loan. 

Both sides are in fact occupied by owner- from what my agent tells me, it's a parent/child situation and no (or minimum) rent is charged.

Though I would think you would need a controlled enviorment Temp , Humidity , etc; Just curious 

I agree with @Daniel MohnkernDaniel you being in California has a whole different set of potential problems as my parents have been on the wrong side of this situation and the end result was the tenants got to stay in the property for 9 months and then they had to pay for their moving expenses because of a "perceived" violation of their rights....Anyways as far as whether the property is abandoned if you are getting rent money then I would not disturb it, if you stop getting money and they are gone then thats a different story.

Per the link, the definition is: “[o]ne who follows another in ownership or control of property.”

I then asked my parents, wifes parents and some neighbors (55-65yrs old) and they all said no, they had never needed to do it.

Contact , zoning as far as vehicles , animal control , the health dept .  

In exchange for this permission, the Tenant agrees as follows:1.To keep no more than 1 domestic dog(s) as described below.2.To pay additional rent in the amount of $ 0 per month; or3.To deposit with the Landlord a "Non-refundable Pet Deposit" in the amount of $ 250 which shall be held as security for the faithful performance of this pet Agreement and shall be used upon the termination or expiration of this Agreement for the purposes of cleaning the Premises.4.To keep the pet from causing any annoyance or discomfort to others and to immediately remedy any complaints concerning the pet.5.To keep the pet from damaging any property belonging to the Landlord or others.6.To immediately pay for any injury, damage, loss, or expense caused by the pet (In this regard, it is expressly understood that at no time shall the Tenant apply any part of the Pet Deposit towards such amounts due, but rather, the Tenant shall make restitution immediately and separately from the Pet Deposit.7.To keep the pet under control at all times.8.To keep the pet restrained, but not tethered, when it is outside of the Premises.9.Not to leave the pet unattended for any unreasonable periods.10.To hold the Landlord harmless from all liability arising from the Tenant's ownership or keeping of the pet, including but not limited to any liability resulting from the Landlord turning said pet over to local pet policing authorities should the pet be found unsupervised.11.To dispose of the pet's droppings properly and quickly.Also, to coordinate the cleanup of the pet’s droppings with the weekly lawn maintenance.12.To insure that the pet will wear the appropriate Local Animal License, a valid Rabies Tag and tag bearing the owners name and phone number.All licenses and tags must be kept current.13.Tenant agrees to control flea infestation and will exterminate if necessary, and upon demand, in any and all areas affected with full cost to be paid by tenant. 14.Tenant agrees that Landlord will not be responsible for the injury, harm, or death of the animal, and agrees to hold Landlord harmless for any damages suffered as a result of any harm caused on the animal or by the animal upon another person, guest or employee.

It allows you to have total control over investment choices and gives you the ability to invest in something that you understand and have more control over (real estate, trust deeds, tax liens, private lending, private businesses, etc).

She says she probably needs to take leave without pay from work, as well as possibly leave Denver and Colorado to head back to her parents in Indiana, so they can help with the situation.