Based on your level of interest & ability to use software/systems to scale you could manage a significant number of rentals.

I'm trying to rent my 2nd floor in my owner/occupy, but I'm running into some resistance on my heat utilities as I have oil heat/hot water.Currently I am including water/sewage but tenant would pay electric/heat/hot water. 

I'm going to be patient and perfect my systems within my company first.What exactly does your property mgt company do for you for your buy and holds?

The permits to add a bathroom include how an additional bathroom affects the current sewer system/ line.

The assembly version , has a yearly "fee" , a mandatory registry, inspection mandates, a water tax(for cape cod) and, most ominously, a graduated tax rate applied to owners of multiple properties.Like your area, Cape Cod ,has been a thriving short term rental market long before the internet was a thing.

I love the work and have ethics and integrity all while maintaining systems and patience!

Do any of you have a good strategy for minimizing water expenses during vacancy? 

So these solar panels are akin to someone having to pay for a grinder pump when getting city/county water/sewer service, right? 

There is a solar panel system on a lease and the lease is terrible.

Numbers wise, I'd need a $75/sq.ft. builder on an improved (all site work, including septic and water taps provided) and permitted lot I would provide and my target would be $120/sq.ft. retail.