And if Vegas ever runs out of water...

These are some of the other items that need to be budgeted for roof 25 year life span, appliances and hot water heater 12 year life span, hvac 20 year life span, bath and kitchen remodel 15-20 year life span, etc.

Across the country the general price for water is about $7/1000 gallons.

"Home needs cosmetic make-ready, new roof and hot water tank.

Verifying if smoke detectors are functioning, appliances are running and water pipes are not leaking is a plus.

I own a condo in Gatlinburg- 2/2 and the HOA is $290/mo but includes wifi, water, cable, trash, and sewer.

However, many rent supply stores have them for rent and every insurance claim with odor issues (fires and water issues (mold)) includes there use in the remediation. 

@Bill Brandt, that is just an estimate for Electric, Water, Sewer, and Gas for THREE units.

I would assume you would want to budget for roof 25 year life span, hvac 20 year life span, appliances and hot water heater 12 year life span, bath and kitchen remodel 15-20 year life span, etc.

With your current estimates, you're essentially assuming infinite lifespans for the property's various components (roof, foundation, HVAC, electrical, plumbing, water heater, etc.).