@Enrique Toledo  If the seller is firm at 10% down, you can always get a personal loan for that 10%. 

@Levi Perl Since your single-member LLC (SMLLC) is a disregarded entity, all rental income or losses are reported directly on your personal tax return rather than at the LLC level.

When structuring a deal, what might work for one person, may not work for the other.

I take a picture of their driver's license.I ask for phone numbers that accept texts and any alternate land or business phone numbers.I ask for the names and birth dates of anyone under 18, and ask if there are any service / emotional support animals, together with their names and breeds.I also ask for personal references, previous landlord contact info (and length of time there), employer contact info (and how long there, together with earnings), as well as the name and contact information for their manager / boss.

This is a very personal question that is difficult to answer. 

I personally would avoid over investing in this unit.

I personally like index fund investing in funds like VOO.  

For my personal portfolio I use a modified spreadsheet amortization by VERTEX, available in Google Docs.  

@Kris Lou Many factors go into PMC pricing:1) Locality (city/state)2) Neighborhood & Property Class (time to manage Class A < Class B < Class C < Class D)3) Property condition (slumlord properties hard to manage)4) Number of units (some economies of scale, but not as much as owners think)5) Owner expectations (some owners really want a personal assistant!)

I personally haven't done this but I have helped clients do it in the past.Hit me up if you're interested!