There isn't even a thought or decision here... had they come to you with a heart tugging humanizing story at least there is a chance you might consider especially if you feel the circumstances extraordinary, or be upfront and honest about whatever hardship they are facing and perhaps you have a solution that works for everyone - but a threat? 

I am not a lawyer...repeat I am not a lawyer, but depending on the circumstances and your relationship to your partner(s) you may be able to simply collect funds without forming a syndication.

Kind of like the same circumstance in the book, so I did the same thing and said we'd split it 50/50, honestly if he wanted more I'd do it.

Consider this a $100 lesson and move on.Don't ever start an application until you have the money, a complete application (no blanks), and all supporting documentation (proof of income, picture ID, etc.)If you have more than one person applying together (husband/wife, friends, etc.) then you don't start ANY of the applications until ALL applicants have provided you with everything.You should also have a statement that application fees are non-refundable under any circumstance.

That's usually at least 30 days before the next time rent is due, but can be longer under some circumstances.  

You need a right set of circumstances for this to happen. 

When objectives differ then it can become difficult, especially when liquidity is problematic and circumstances change over long periods of time (as pointed out by Mike Dymski).I also agree with Chris Martin’s response – rather than jump into something big, I would prefer to partner with some people, get comfortable, then scale.Legal aspects can be solved.

She provided instant updates, was always reachable for any questions, and was very flexible to my needs and circumstances.

She grew up in an impoverished circumstance with her father moving them around a lot.

Key is having the discipline to follow thru with the understanding that sometimes life can get in the way and our circumstances change. 3.)