My other option would be to buy a 2 or 3 bedroom single family and rent the additional bedrooms.

If you "jack" the rent up (even if you find a tenant willing to pay it), typically the appraiser will not give credit for additional value above and beyond what market rents would determine.

Sure people get notices but they get calls, door knockers and agents in addition to direct mail by the truck loads especially if there is equity. 

In addition to needing a pre-qual, I want to familiarize myself with a hard money lenders' requirements and processes, so I can jump when I need to, now or in the future.Does anyone have any recommendations?

I exclusively use our local MLS.

We ended up backing out of the deal cause the additional cost to the deal at that time.  

In addition, you might look at this thread if you are still considering investing there as a counter perspective to what has been posted.Obviously you can make up your own mind.

I don't believe the 5000 sqft factors in even if trying to squeeze in additional units.

Thankfully had flood insurance in place on our rentals, in addition to regular policy.  

I'd wave the screening fee. if they meet everything except income criteria,, then ask for additional security deposit.. paid over 30 to 60 days..