One unit has nearly the full back yard and has a lot of water irrigation.

Which is used to keep pipes from freezing but guess that doesn't particularly mean it's a water/sewer line 🤔 .  

Will I need to pay for sewer, or is this included in the water bill? 

@Rob Ibarra Converting non restaurant space into restaurant space can be fairly costly from what I understand due to the need for larger than standard water lines to service the building and a general need for grease traps and other restaurant specific infrastructure.My first question around going from abandoned auto shop to kitchen is zoning, could you even get the use approved, and then are their any environmental factors in play? 

It is located very closely to a Pond (+/_ 10-15' from edge of water to house); so it is very close. 

Interested SFH's near or on the water or at the least with a pool. 

Gas, water, elec are unnecessary.

As far as positive ROI - I'd like feedback on the following items:-Switching to tankless hot water heater (current water heater doesn't look so hot)-Upgrading electric panel to a Span Smart Panel.

A couple of the adjacent cities are planning on building 2500 new homes in the area...not sure of the impact as there is a water shortage due to salt water intrusion.  

Everything I have spoken of thus far is not in regards to water properties and cottages.