Personally, I think I would stack some cash for a year or so while I did this. 

I don't know if they still do it but if memory serves a few years ago TD Bank would do a HELOC on a rental in second position but only if it was titled in someone's personal name. 

Or a personal loan if interest rates aren't cost prohibitive?

People want reliability, honesty, being on time, and having a good personality more than just a few $$.

You have to enjoy and reward yourself sometimes.

Buy it personally, and rent it full time to my C-corp?

Quote from @John Friendas: As a person with an average salary, I was wondering what the maximum amount of DSCR loans a lender would give out would look like?

Unfortunately, this problem waste a lot of my time that could be spent on other investments.I have used the same tax professional for many years and he is very educated, but also much older than me and it's hard for me to understand all the reasons he has expressed why is better to put the rental on my personal tax returns.

I do not personally use him based soley on the fact that the firm is virtual.

So the question becomes based on their individual and personal tax situation what is the estimated tax burden they'd save?