I understand the processor bankruptcy caused a big disruption but it also seems like FTF (Upright) was overly leveraged because they've proceeded mass sell their loan book, which means if you held one of the loans that will be sold you will receive no interest until due diligence is completed and possibly a hit to principal depending on the final price the buyer pays. 

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You will likely receive some credit towards the value but not as much as most people think. 

The other option I can think of is to take advantage of credit card offers you receive in the mail that include a few checks with a 0% finance offer for up to a year.

We also began to receive notices from the city pertaining to code violations.

You can either assume higher reserves for years 1-3 (or until the HVAC goes), adjust the purchase price or receive seller credit.

You won't receive nearly the amount of buyers if you do a FSBO, and of course you have the chance of something going wrong with the paperwork. 

If having rental properties was to be our main source of income, how would we go about receiving financing. 

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Investors should be able to apply for and receive STR permits under the same rules as owner-occupied properties.