On the water supply side, its highly unlikely its tree roots. 

Theres too much controversy, too much regulation and too much supply in residential zones.

It seems like Phoenix is growing rapidly and that they are building down there and it won't be anytime too soon that the supply will meet the demand.

Not sure how to offer "fresh" items like milk or bakery muffins if I can't have them in a supply closet for the maids to put out after a cleaning...I am putting a Keurig in and planning to offer a variety of coffee, tea, and hot cocoa pods and some shelf-stable half and half or creamers.

Buildable space is limited (low supply & high demand = $$)con: traffic up there is misery.

The price will be driven by the number of fixtures and lengths of runs of piping, but I just can't imagine it costing it anywhere near $30 to $40k.For a similar project for me in Kansas City, re-plumbing new water supply lines would be <$10k.I think big risk is how much water damage, mold remediation, drywall patching, insulation, framing & other finishes needs to be replaced?

Imagine the amount one has to pay a real estate agent in expensive places like, San Francisco Bay Area considering most of the time sellers and buyers agent is the same person #SCAMFor example, If a home is listed for $1.5M in SFO - agent may take home $60k for doing very little since home sells for itself there because of the bidding war and low supply.

Unless they're very far from jobs, because of the supply and demand. 

I've also heard of investors accompanying their GC's to a supply house and buying all the supplies and then only paying the GC for their time. 

This plus SB 827 dying in committee don't bode well for any sort of supply side fix to the issue.