The maps and things are possibly not as critical at first, but they will tell you if there are things like utility easements or (maybe) flood zones that you need to think about. 

If you are thinking it's the money...Note that the hard money lending industry has that covered. 

I rent the units out totally furnished with all utilities.

I've had good results with running STRs in a depressed town with one big industry. 

This included not only looking at the sites themselves but also interviewing investors about their experiences.Realty Shares is unusual, because it has some of the most impressive features in the industry, and it's also one of the most complained about sites.

Only utility to pay out of my pocket is water.

@Abad MarroquinYes, 79k out of 80k used on a HELOC would hurt your score as your utilization would be 99% and basically once you get to 90% utilization, you're considered maxed out.

Things I'm wandering are HOA fees,  certain utilities, yard maintenance?

@Taylor CochranOkay.So, you have to treat this like a buy and hold rental with you also living in one unit.So, you need to calculate the cash flow and the ROI.On the surface, if you're renting part of it for $1,750+ and mortgage would run around $2,500 at 4.5% interest rate.That leaves you with a negative cash flow for the investment before you consider property tax, home insurance, and reserves for maintenance, capital expenditures, vacancies, utilities, and property management.You should check out the Bigger Pockets video on rental property analysis.

Got stuck with utility bills as apparently utilities are tied to property, not the resident (in this case, tenants).