Then on top of that we usually discover a heat vent covered in asbestos & full of old oil fce residue/dust, then we discover a run of random cast iron vent plumbing.

That won't cover the "hassle factor" which you should also consider, but from a numbers point of view, it is very enlightening.

A 3 or 4 unit must also meet the self sufficiency rule (75% of total projected rent must cover PITI plus mortgage insurance).

If we look back at 07-08, investors in this situation suffered the most because they were banking on the market increasing.I would consider what your "why" is for investing in multifamily and then dive into educating yourself.

A particular MLS might cover multiple states, or might only cover a portion of one.

He needs $150,000 to pay off back taxes and a lien that is covering all the properties.

There is a married couple, with 2 kids that claim they have (570 credit score), that their credit issues are over 5 years old, both are holding jobs for over 3 years, with enough income to cover rent, and they are willing to provide a co-signer.Should I just continue to wait for the application that qualifies completely or should I look into this one more? 

Fast forward a few weeks, I found another but this time I am borrowing a portion of the needed funds from family and covering the rest with what I have available. 

It appears both have a cover charge for non-members.

I pay mortgage, taxes, insurance, repairs, management, etc.Account B: Tenant security deposit is held separate from all other funds to ensure I don't spend it.Rent income should be more than enough to cover the mortgage so why are you putting money into the account?