While Greece is generally still cheap compared to other European locales, partly as a result of the Global Financial crisis, real estate on the most popular islands like Mykonos, Rhodes or Santorini is actually very expensive - as much as 10,000 euros a square meter.

We have a single-family residence with a large in-law quarters (basically a duplex - but no separate meters) in Flagstaff, AZ that we have used for as a personal residence for the last three years.

These units are all metered separately.

Thanks for sharing @Derrick Craig, building costs for materials and labor in NZ are very high. for single level houses, Brick and Tile and Single Garage, say 3-4 bed 2-3 bath you talking $2500-$2800m2 ( per square meters)   that's about $1800m2 - $2000m2 USD.So unless you are a builder and can cut the margin, 3 bed, 1 bath house, say 1100sqf (which is around 100m2) price will start at $180k USD.

Is the guest home separately metered for any utilities?

His gas meter is in the basement (which is locked and off limits to tenants), so the utility needs me (or someone I trust) to let them in.  

I've thought about it for a rental property, but it would require an internet connection, conceivably the tenant, in order to provide the feedback from the meter portion. 

-No Park Owned Homes-City water and Sewer-2 apartments-13 owner occupied spaces, One vacant space -Not currently sub metered -2 acres of adjacent raw land sold with park-Approx $40,000 of notes on seller financed homes sold with park-Very good condition and good monthly collection-Along the main route through the city of Willcox, Arizona.current expenses include manager, water, sewer, trash, taxes, insurance, and security lights = 38.42% of GINOI: $29,188ASKING PRICE: $295,000Seller financing 30 year amortization with 6 year balloon. $75,000 down.My concern is that this park is located in an area that is "Middle of nowhere" status.

If you have the automated reader installed on your meter, you can look at usage on each property/meter daily if you want to via the CLE water site. 

You shouldn't need to spend more than $100 on the meters themselves