For example, an experienced plumber may suggest putting hammer arrestors on a plumbing system, to help alleviate potential water hammer problems (knocking noise) and prolong the life of components/fixtures/appliances, but the local building code may not require them.It would also depend on what you are doing the work for and how the deal #'s pencil out.

In terms of new construction, a couple things to be aware of in San Luis Obispo County are water shortage issues and development fees/taxes which can significantly increase the building costs.SLO city and the neighboring cities are particularly diligent on their water usage, as most of the county's water supply comes from three surface water reservoirs and a groundwater basin.

Next was a warped vinyl floor related to a water leak.

I would recommend you get way into the weeds on your due dilligence- septics, roofs, subfloors, hot water tanks, drainfields, etc. 

Wired internet cables for laptopsObviously towels, toilet paper, shampoo, body wash, etc in every bath Keurig for coffee if they'd like someGym in basement Washer/dryerLocks on every bedroomMaybe even a fridge full of beer and water

(Please note that I get a significant MSRP discount on my S-W purchases) Emerald is great from a water-based standpoint, but is a lot more pricey and I have not been able to justify buying it for use in my properties outside of one 120 year old banister. 

During the inspection the water heater went bad, and my PM knew I wanted the property so she neglected a new water heater in the deal!

They have been good as tenants, but I'm charging well below market with the agreement that the units are as-is and non-residential.The building is partially renovated, partially demo'd, has ancient plumbing and electrical.

Most are 'ancient' conversions of larger homes and are not very nice.

Thanks.I have a building with two panels and two meters and one water line.