We have 1st, last, and security deposit. 

I am concerned that because of my age and lack of money I will not be taken seriously by banks when trying to secure a mortgage.

In a perfect world my virgin purchase would be a duplex-quad, one unit of which I will live in until I can secure my second deal.  

Can I officially be nominated for the dummy of the year on this one? 

Even some real estate professionals get confused over the difference between an addendum and an amendment.An addendum is something that is added to the purchase agreement (the contract) before it becomes officially valid (known as “ratification”).If you were performing a short sale, for instance, we would provide the buyer with a short sale addendum before we accept their offer.

When I did so, she told me I was supposed to have scheduled the walk-through and when I told her I didn't have time that day to do so, she told me it wasn't required, I could just leave the keys (and parking passes and laundry card) and a forwarding address to send me the security deposit refund.

The funds to secure the loan are in MY name only. 

The GP is responsible for securing the debt.

All states differ but I would think you keep the security in light of them not paying in the first place.

They give off all the right "good tenant" vibes but I realize I don't know how to do a background check on people who don't have a US social security number.Any tips?