-Not setting aside reserves or underestimating long-term capital expenditure needs.It doesn’t mean cash flow doesn’t exist—it means they’ve learned hard lessons about the realities of real estate ownership.Final Thoughts If you're starting out, focus on building a strategy that fits your financial goals and risk tolerance.

I believe they are expressing their displeasure with the fact that I have not accommodated some of their recent requests that went far beyond the scope of what is required (like insisting a licensed electrician switch out a smoke detector when we could do it ourselves) and I had to set some boundaries after years of high maintenance for them.

Also look into whether the city has already set up regulations around STR or whether there are potential changes coming down the line. 

Provided you are sticking to the letter and spirity of your rental agreement, you have to set boundaries People that get indignant over you setting boundaries are not worth worried about. 

It never hurts to have an additional set of eyes to look after your property.

What sets your lisitng apart?

The problem with that set of formulas is that a fixed rate loan will NEVER have different monthly payments due (your example starts at $675, then $674.25, etc.).  

You know how to manage a property.To get started, your first steps should be getting licensed then meeting with a local RE attorney so they can help you get set up with your contracts, management and lease agreements, etc.

I wonder if the change of density could off-set cost of underground enough to make it make sense.... 

I would say get connected with a local agent and also set up with a lender that has you pre approved to make it super easy making offers.