We've been talking about joint venturing on a property together (50/50 or 60/40, however we can make it work) and I'm trying to figure out a way to arrange this with their 1031, but I'm not sure if they are allowed to partner with individuals outside of their LLC or how that could work.

Surrounding yourself with like-minded individuals will push you forward much quicker than you can imagine.Feel free to connect if you want to learn more.I own 75 units in Albuquerque and know the market pretty well.Jens

If they're unhappy because some other child is being selfish with some of the equipment in the park, it is not the time to distract them with a treat but rather to teach them empathy and how A) some kids don't learn to take turns, and that's an objectively bad thing, and B) why I demand that he takes turns himself rather than hog the favored piece of equipment all to himself. 

Most DSCR will need to be around 1.1-1.25x most purchase agreements will have your individual name and or assignee and assuming you have all the entity documentation required by the lender (articles of incorporation, operating agreement, bylaws, ect.) you should be able to get the loan in your entity's name.

I am planning to begin real estate investing by forming a partnership with a family member - my brother in law.Neither of us has established an LLC for these purposes yet.I am trying to decide which would be better:1) for us each to form our own LLC individually, where one is the owner and the other an investor, or 2) we form a single LLC as partners.I would love to hear thoughts on potential pros and cons of each, or possibly other alternatives.

An important part of your task will be to try to figure out which bank department and individual you need to talk to.If the owner has vacated the property, I think your chances of finding him and convincing him to cooperate will be slim. 

I have been working in this area for my W2 for nearly a decade and have seen even individual homeowners fined thousands per day for violations.

The answer to that question and what your goals and objectives are about bringing them up to market rent is the key to answering this question.  

The best strategy for you will really come down to your individual risk comfort level.Whatever path you go with, though, treat the businesses religiously . . . attend to them in every way as separate businesses if they are separate and you'll hopefully uphold the purpose of an LLC with operating as a business in earnest.

Echoing @Curt Davis - I would definitely have each individual person sign a lease for their own room if they do not know each other.