The agreement stipulates:"The owners agree, that no water shall be used for commercial purpose, but only for their private domestic use including vegetable gardens and livestock maintenance."

I'd like to get some ideas about the current landscape of commercial real estate. 

Things like landscaping/snow removal and labor cost for repairs are going to be highly variable based on your market so you'd need to do your own research on the going rate by either talking to other local investors, running your own google search, or exploring basic services on thumbtack/angies list etc. 

I have almost an acre and would love to get some upgrades done on the electrical and start specking out an ADU but because of my experiences so far with everyone from electricians to handymen to landscapers I'm holding back for a while.

Mainly I’m trying to avoid “aged poorly design” glassblock walls, small bedrooms, older windows (wood/aluminum, single pane), aluminum patio covers, and to a lesser extent landscaping.

That means if you could get $6,250/mo, have zero repairs, zero maintenance, zero capex, zero vacancy, provide zero lawn/snow/landscaping, pay zero utilities, and pay zero management.

We do nice kitchens and stainless appliances, have cleaning service, pest control, landscaping and address any maintenance issues immediately. 

@Andrew SteffensI use Eryck Castillo for landscaping 239 253 2895

Anything over that could mean that the property is overstaffed, or it could mean that management is delivering a very high level of service such as in a luxury property that has a doorman and all sorts of staff that you don't typically see in garden style apartments.

Is the old adage that landscaping doesn't get any ROI in a middle-class market still true?