I've heard an estimated cost of about $270 per year but there are some variables in there like climate, age of the water heater, number of users, appliances, etc.Assuming your water heater used $300 a year, that's only $25 a month.

Between the population migration out of California plus the political climate being unfriendly to landlords, California isn't very appealing. 

Climate is quite different here.

The overall climate of your investment is much more important and valued as far as rules go. 

Pay attention to the time frame and market climate during which Robyn operated her flipping business.

The large cap deals that are moving forward in todays capital climate are sponsors with 40(ish)% of the cost in the game.

I was looking at the A/C zone in the link provided by Climate zone.Mine says 2 ton instead of 1.5 but mine are quad apartments with 4 units to a building at 1,178 sq ft each unit.Maybe over the last 30 years because of hotter climate they now recommend 2 ton instead of 1.5.I don't know if the chart is meant for houses only or calculates apartments differently.Hey Justin is the 80 bucks include the cost of the thermostat??

Primarily because of population and job growth, the strongest predictors of real estate value...but also the weather, climate, economy, etc. 

I California's climate and outdoor life, Arizona can accommodate both of those things (I would most likely be traveling during summers, so not worried about the extra heat!)

My local storage facility charges $120/month for a 10'x10' climate controlled storage unit.These options may not make as much as your idea of an ADU but at least they are legal and require little up front cost.