Of course, with all things, the situation varies and no one on these forums has seen your underlying documents and the actual terms, and thus, you should consult with legal counsel specific to your situation. 

Also, for short term rental owners in general, how do you find the necessary numbers to underwrite deals?

If I have to goto the bank, then the mortgage terms are going to change as it would be change personal mortgage to commercial.

So we're looking at building to rent as a long term investment.We've already done all of the financial side, so that's all set and happy and ready to go when we are.However, all we're hearing right now is that all builders are super-busy and taking jobs 1-2 YEARS in advance.

However, if I'm just looking at the structure/improvement I believe that a home would depreciate following a curve in the same way that most physical goods depreciate on a curve (in terms of real dollars, adjusted for inflation). 

looking for suggestions on best methods/websites for marketing a long term rental.

If you want to learn more or get an idea of what the terms might look like feel free to shoot me a message

It is being fixed up to rent right now.The land I have under contract to sell as is with a Quit Claim deed.

While not in TN specifically, I have assisted clients do as you have described: live in a property as a principal residence for 2 years, rent it out for 3 years, then sell.Based on the situation described, you would appear to be eligible for the MFJ joint exclusion on principle residence on your 90% share.However, in order to retain that ability, the house will very likely need to be sold (ie, sale closed, not just under contract) by the end of this month. 

@Maxwell Hinesshort term - BRRRR method, for example.buy with cash or hard money, rehab with HELOC money, then refinance and pay it all back.you never want a HELOC as part of a long term situation.