There are numerous state and federal laws related to buying and selling mortgage notes as well as originating mortgages/contract for deeds etc.You have Dodd Frank as well as numerous other consumer protection laws that you have to deal with. 

@James McGovern if I can assume by "undocumented immigrant" you're talking about someone who entered the country illegally, he/she would not be considered part of a protected class under federal / state Fair Housing laws.

A few points, different tax laws and language barriers made it more difficult.  

All legal interpretations deserve the attention of legal counselPennsylvania's Real Estate Tax Sale Law says that you can't redeem your home after a sale. (72 P.S. § 5860.501).

I think the law has changed, but just make sure you have a good Mexican abogado to help you with your purchase!

Law requires a 3-day grace period, so I charge a late fee on the 5th and never waive it.3.

Would there be any lenders that allow for a VA loan for a duplex when both units are leased for 10 months? My loan officer is saying no, but the literature I'm seeing says up to 12 months delayed occupancy is allowed ...

Find about about the charge (Megan's law site).

.- Im thinking of not charging security deposit because of all the strict MA laws and just using the last months rent as a sort of security deposit, thoughts?

My goal is to rent it out and then in 3-4 years allow my mother-in-law to move in as she is wanting to retire in the area.