Maybe you don't know how to differentiate between ordinary maintenance and tenant neglect/abuse?

But it's also mildly higher maintenance. 

There is a nuance here: building code versus maintenance code.

Will they have trouble making the payments to you while also having enough money to keep up with the maintenance and repairs/ tenant issues/ all the expenses involved with owning the property?

We buy seller financed notes routinely and would be happy to evaluate what you have.

Do I just do my normal routine, follow up after a couple days if I don’t hear anything? 

It drives me crazy when I hear these stories preventive maintenance is what should be practiced and discussing all avenues of the deal and the borrowers docs in advance.   

I am not opposed to the idea but definitely need to get more educated on the details such as where exactly, is it too crowded of a space, how to be competitive, maintenance requirements for a beach rental, etc.

I even had preventative maintenance set up, but the root growth rate was unpredictable.

The income isn't covering the costs (maintenance, capex) and you've only gained 15% appreciation in the three strongest years we've seen in a long time.