As far as "mid-term needs", did you have any specifically in mind? 

Keep in mind this will be at a much higher rate than your current 3.2% interest rate, so I'm not sure if paying off the existing loan is a great choice.

Like Covey wrote, begin with the end in mind.

You can find different strategies on how to find and reach these folks, such as driving for dollars, targeting mailing lists, networking with Realtors and other wholesalers, and having an online presence, plus paid social media ads, etc.

You have to keep in mind that a plex will never be valued the same as an SFH, and renovations may not have the same effect on the value as an SFH.If renovations are not needed right now, I would work toward getting the rent to market for the as-is condition and then renovate each side when you have turnover. 

but if you are just looking for a use that requires minimal investment, your hosting of farmers markets etc is where my mind goes also. 

No one in their right mind is going to file a lawsuit over 2k.. they may and should just take you to small claims and or as Greg stated file their lien and wait.Also work done to YOUR satisfaction is a pretty weak argument and totally subjective.

It's so hard to say generally what problems might come up, but the first that comes to my mind is work history - do you have 6 months on the job and a 2 year work/school history? 

We use Quickbooks Online for our main accounting software.  

That's a real bait and switch scummy thing to do, but I guess I shouldn't be surprised these days. keep in mind this is not usually bait and switch it could be and they are not being scummy.they simply are at the whims of thier senior credit facilities wants and needs..