To establish a 50-50 ownership in both the property and future profits, you'll need a formal agreement outlining each person's contributions and rights.

In other words, two financing agreements "wrapped" together.But the goal here would be for the 2nd buyer to close all-cash (to skip the financing process), would that still work? 

I wouldn't have brought a plumber out for a smell like this without tenant's agreement to pay if nothing was wrong. 

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If not, I'm guessing it would be treated as a traditional rental loan, either conventional or DSCR, using market rents rather than the rent in the lease agreement.

What is a JV agreement? 

Review their management agreement.

If they have an legally binding agreement, you need to honor that agreement and pay the fee.If you failed to mention to the agent that they are going to get paid, and then explained how, of course they won't present the offer.

Is it appropriate to ask if someone is willing to pass on a purchase & sale agreement template they use?

I got an estoppel agreement filled out to figure out lease terms, etc.