This is the heart of the reason housing isn't mroe affordable, that landlords bear these types of costs every day.You could probably find cheaper labor, especially to haul away the junk, but not easily as an out of state investor. 

This type of deal can also help you minimize upfront costs, as you’re reducing the cash needed to buy the property outright by aligning the seller’s financial outcome with yours.While there may be details to work through, such as crafting a solid contract or ensuring alignment with any financing you bring in, these can be easily addressed with the right team in place.

Are you able to use it easily, only with a HELOC.If you lose your tax deductions, then Uncle Sam is happy to take more of your money each year.Good Investing...

Their return would be backend loaded years 4 thru 10 and further out.  

so you can easily do some background on the principals..

And if they have been at the same job for 10+ years where you know you’ll be able to garnish their wages easily.

.- Potential for higher returns - Flexible pricing - Short-term commitmentCons.- Requires active management - Subject to regulatory risks - Income can vary seasonallyI wish you the best in your new venture.

I would sell the stock to pay off the mortgage.You likely have to make a 11% return(pre-tax) from your stock portfolio to make the 8.125% interet payment.I.E.

(We had a boat as an AirBNB and the plumbing would clog very easily and we had to state a similar statement and it got us out of refunds and bad reviews) hope that helps! 

This will make it a lot easier to manage, will cost you less than buying on the market and typically you can get 1:1 rent returns.