-I would have very little collateral, no say and no compensation for 72 months.

I would not necessarily advise remortgaging, based on possible market adjustments in the future, but keep in mind your increased mortgage would be more than compensated for through investing the money.

In your situation, the Seller has requested 30 days after the close and I would say that would be acceptable as long as the Seller compensates you for your carrying costs.

But the ones who pay on time every month, who take care of your units and who have been there for years, you don't have to squeeze every cent out of them, because the other units are more than compensating for them."  

But, your first priority was to get the loan and you could've always chosen to compensate them somehow, but that is pretty unusual.  

., a minimum payment every year) to compensate for services provided? 

Must be willing to work for little or no financial compensation at first when you're learning first hand.

I’m even willing to compensate him.

-You are in control of what you offer or do not offer and their max compensation is a function of your highest and best bid. 

Contractors are the toughest part of the equation, it is a good idea to read the forums about how to best hire, compensate, and keep your contractors on task.