. $750 if install central AC and fencing.

I don't know how to investigate this further.Another reason I am inquiring is because we are debating on installing a coin operated washer and dryer on the premise because our water bill for 3 units is over $300 a month and I am guessing a lot of that is because two of the units have washers and dryers.So if they can still do their laundry while giving us a little extra money or at least evening the price out that would be the ultimate solution, but if the shared water would still be an issue then this would obviously become a problem if the tenants electric bills start to go up.

Hey everyone,I inherited a commercial unit in an industrial park that is currently rented out to a tile company (it was rented out when I inherited it).  

I couldn't lay a piece of tile 3 years ago, holes in dry wall scared me, and bugs...don't get me started.

Tile it if you want/need it to be nicer and last longer.

New water heater installed in B unit as well, just a few months ago.

I know of a guy that simply gets a VOIP line to run the intercom and the "Phone calls" go out that way to the tenants' phones.I think he said the company that installed the security cameras also did this install.

Essentially it's such low ampage that anything would do, but I'd like it to be compliant.I've been reading the code, and I'm making one alteration to make the installation an extra half inch from the roof deck (they were going to be 1.5" from deck, now 2"), but I can't find the exact codes for the wiring type.I have found some CL rated speaker wire in 18gauge, rated for 150v.

Tile over it.

Could be a number of things like improper install, wood shrinkage, framing deflection.