In short, the memory capacity of a smartphone is pretty limited if you take enough photos, so best to buy a separate camera. 

It is a separate entity.

In the city you get one bill for water and sewer; in the suburbs you can expect to have separate bills for those.

But I'm unclear if rent credits will actually qualify the rent as a security and require the note to originate through a licensed loan or mortgage broker.Or is the best bet to do a straight lease, and keep the option/purchase a separate deal?

First mistake, provided a free incentive to please and secure your tenant, you should always stick to the rules, you must charge accordingly, always enforce pro-rated terms, if/as stated in your contract ease terms.I always like to say that an exception, quickly extends into the rule (As a general rule of thing, we absolutely do not bend on any rule and enforce every element (within reason))Another view is that if you are the individual, the owner, the landlord, the point of communication, it is more difficult to distance yourself from the emotional element, sometimes the emotional attachment to the asset, will shut down your business side of thinking for a brief weak moment, you must restrain from that.

So you just have to do two separate closings with the first purchase funded with money that is not from the second purchaser. 

I am looking at a buy and hold off Walnut behind the I-40. 2 separate units metered and set up that way.

In some areas all units must have fire doors and other separation.  

There is a separate section for occupants.  

Those materials are great when it comes to separating from the competition, but it doesn't really make the house worth much more than the size and the neighborhood.2.