So those kind of people tend to want to get their sleep necessity out of the way as soon as they feel like they're not productive, which often means going to bed early, and thus waking up early and getting going on whatever it is they're doing.

Whatever the reason, people will always rent homes by necessity.

People need housing and shelter is a necessity in life.  

Another was rehabbed by 'necessity'.

It would be nice to be sitting on a a pile of 200k, but sometimes hard money may be a necessity.  

My main question is what contingencies are absolute necessities to include in contracts when getting a property under contract that I will need to raise financing for at a later time?

When I was young out of necessity I co-sign a mortgage with my step dad.

@Alex Jones Necessity.

I sold my gold out of necessity during the Great Recession.

I also think most landlords don't realize that ESAs are not covered by the ADA, only Fair Housing, and that the landlord does have the right with service animals, if the disability and need are not readily apparent (i.e. a seeing-eye dog), to ask the specific function of the animal and documentation that the animal is a medical necessity.