Loans for flips are usually 12 months in length and only require you to pay interest each month.

While I agree with you and the length of your track record, there are many groups out there that can say: we have been at this since 2017, and have a longer track record than the potential LP is likely to see from the many other groups that only got started in 2019, 2020, 2021...  

I provided a strategic offer to win in a multiple bidding scenario using discernment around the due diligence fee and length of timing.

I would just make it clear to the tenant the length of time this will take and that there will be no further rent reductions because of any inconvenience.

Here is the rule from the IRS regarding length of stay for short term rentals:As defined by Treasury Regulation Sec. 1.469-1T(e)(3)(ii)(A)The average period of customer use is 7 days or lessThe average period of customer use is 30 days or less.

There’s several things I would recommend but here’s a quick summary:1) furniture does not add value to the appraisal value - a a financed buyer if buying your property at or above its appraisal value is going to have to pay out of pocket.2) it comes down to marketing, and I can go over that in much more length than I can here in text.  

It would be difficult for anyone to claim an STR is not residential with that definition.The difference between STR and MTR or LTR is the length of stay.  

A person will either meet my criteria or not. if they meet my income criteria, length of job, have good refs, don't have serious criminal backgrounds, or evictions, they get the offer based on date/time stamp.

At the end of the day, the sellers looking to transact in creative finance transactions are normally the owners of real estate that cannot sell easily in an arms length transaction or are gouging  the buyer on price.

That's a low-return improvement, compared to say new bathrooms/kitchens.IMHO, if you expect to increase your net through rental and market appreciation, consider the length of time it will take to realize that goal—many years.