Never making a large salary.Like you said, its incredibly important to make these big sacrifices before having a serious relationship and/or marriage and kids, because most times the significant other won't be on board to live so far away from everything.

@Caleb Genry It would be incredibly helpful for you to share this spreadsheet with me. 

Ideally, you want a 700+ score.

If you expect further growth, holding onto the property could still make sense.Final ThoughtsSelling isn’t a bad option, but you’re giving up an incredible financing advantage.

That way she could see income, credit score, background check, etc.

So I get this referral from a relative about a tenant who has good credit score, no criminal history, and a good paying job.

The people who never ran properties in B or C area always scream about how bad idea it is but you can make an incredibly profitable listing in those if you know how to manage it.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

There are a bunch of ways to do this depending on the property type, usage, and you (income and credit scores).If this is a primary residence, you can get up to 90% of the value of your home minus any exisitng debt. 

I need to do some research on what credit score I need to actually begin this process