And I don't mean this as any offense to all the investors I love reading about on BP but having billion doors seems to me like you are likely to miss out on things that more important in life. 

Why would you want to work with a realtor (I know she is your wife, no offense) who knows none of the agents, does not know the paperwork or the process (they don't teach you this in the class) when your primary residence is on the line.Brokerage options vary, but if you just choose the cheapest one and use your wife, you will pay for it later.

One bad tenant can drive all the good tenants out.Drugs and other offenses are widespread in the neighborhoods where most multi-family properties are situated.

If I have anything incorrect, I take no offense at having anyone correct the info.  

I also want to point out some fallacies from @Steve Vaughan, I am not intending to cause a fight, and I hope I am not being offensive here. 

A criminal offense?! 

If you search hard enough, you can find something offensive in virtually anything.  

@Gaby LiuNo offense but I wouldn’t place the blame on others for your lack of due diligence.

No offense but how much experience does the college dropout roommate bring to the table?

Hopefully, they focus on evictions, so they aren't overcharging you and know what they are doing.ROOKIE MISTAKE (no offense): You should NEVER accept tenant excuses because - desperate people do desperate things!