to people with 760 FICO scores who immediately go into default and should never have gotten that loan to begin with, and we say "no" to people with 579 FICO scores due to an unforeseen (and unforeseeable) medical issue but with otherwise perfect credit.For example it often appears that civil judgements in default do not impact FICO score the way one might think they "should."

Also, any unforeseen costs could turn it into a glorified turnkey with more pain than standard turnkey.    

Also weather delays, change orders, unforeseen issues with permits or environmental, etc, etc.  

Any measure of experience will teach you to plan for the Unforeseen Expense.

Add in a contingency of 20% or so to cover anything unforeseen.  

Have 'unforeseen contingency ' backup cash at hand.Think of it like a snowball going down hill.

You don't want to lose a good tenant due to a short-term unforeseen accident.IF the tenants chose to leave on their own you can also choose to waive the past due rent in exchange for them waiving the return of their security deposit and leaving your rental unit SPOTLESS (move-in ready) so that maybe all you have to do is standard maintenance (paint, etc).At the end of the day we are all about making money - paying our own bills and putting food on our own tables.  

100k seems like a great profit and does afford you a bit of wiggle room for any unforeseen issues or holding costs along the way...

You need reserve funding to maintain the unforeseen.

If you give up too much of the pie you cut yourself out of some much needed resources in case a deal has unforeseen issues or things you didn't anticipate.