If you think there a leak have all tenants not use any water and find the water meter outside.

@Marc Robinson what's the lot rent, who pays what utilities and what's the source of the water and sewer?

@Matt Powers there are endless possibilities and combinations of how you could approach this opportunity.

*As a side note, I think maybe it would be fun also to try and identify where new technology or machine-learning driven approaches could increase efficiency in the spaceAs for my financial situation, personally, I have around 50k saved but 20k of it is tied up in assets I don't want to pay capital gains tax on.

2) Their contractor must be properly licensed and insured and we require copies of all this.

Licensed with permits ~$4,000.Full replacement of all water supply lines and shutoffs from the interior water meter with PEX and an open basement.  1 kitchen 1 bath 1 laundry. 

The power is either on or it's off.

I'd personally say pulling your water heater out and replacing with a wall mount on demand one, would be worth the cost to have in unit washer dryer if you are staying there or renting it, it would be worth it.its always worth doing the big stuff well and correct even if you are cleaning up after someone, the long term hold always prevails, its just a little frustrating front sometimes, but hang in there!

It is long and wide and in a windsor knot.  

(and I love your guitar pic!!