For example: If a tenant applies for a $1,000/month rental and they have gross monthly income of $3,500 they meet the first criteria, but when applying the second criteria you find they have a $500 car payment and $250 child support payment.

How did you find this deal and how did you negotiate it?

Find those sections in your docs and file suit...it seems you've tried the nice neighbor route, so you need to simply press the issue legally now.

Do you have any advice on particular sites to look into to find tenants like this needing placement?

Attracted to 2 homes on unique wooded property.How did you find this deal and how did you negotiate it?

BiggerPockets has a decent system for finding a real estate broker in any given area.

Find a stable job, attend college, or work part-time and do both.

Quote from @Andrew Kubik: Hey Dan,I recently launched my own property management company in Nashville, TN, and my biggest hurdle was finding a broker.

We are considering investing in Houston as foreign investors (from Belgium), our goal is to find and start with a long-term rental single or multi family home. 

I assist my clients with turnkey opportunities in DFW and other TX markets, if that is something you want to find out more about I'd love to share some thoughts on areas within Dallas to focus on.