Worse is the fact that regular  working tenants do not like having welfare tenants in the building.

Anthony, You didn't say if the property is under an llc, if so then @Simon W. is correct about the accounts. if the property is under your name and you are just forming the management llc, then you will need a checking account for that company an account for the security deposits. i recommend separate accounts from your personal account for the business, it helps for many reasons. that said, why do you want to start an llc for the management co ?

I also appreciate the security I get from the credit card. 

If you're a regular cash based tax payer that was 4/17/18.  

Now I agree that it's not a perfect deal, but if I can secure it with low money down and seller financing, I feel like it would be excellent to spend a couple bucks out of my own pocket each month (if I even have to, since I run my numbers so conservatively) to have a multifamily property that is entirely paid off in 15 years.

Regular ROI includes the pay down of principal on your loan as profit (this is also how the IRS calculates it). 

You may just need a regular maid service. 

He goes back and says it looks like the basement window has been kicked in but he could not tell for sure (it has a set of security bars in front of it).

While I regret not having secured the deal prior to the refinance, I still believe it is a good deal, and would like to work something out. 

Cash or regular financing only