Plumbing: 10% tenant's responsibility and 90% of landlord responsibility....I listed 1 and 2 because if tenant does not put sticky thing into dishwasher or drain, 1 and 2 should not happen. 

They have fallen out escrow twice due to a plumbing issue.

Electrical and plumbing included. 

Had a couple of plumbers come and quote, and the lowest number came in above $20,000.We have very little knowledge about plumbing and are wondering if spending such a fortunate upfront when no serious leakage has been observed is a good idea.

Minor things will go wrong, plumbing, sprinkler heads, maybe a cracked window, appliance, etc.

Wiring is mostly done and plumbing, ready for insulation and everything else........

Also you will want to look at the foundation and plumbing as well.  

All of my experience is in plumbing and construction work.

One had the plumbing recycled. 

I am a young plumbing/HVAC contractor (I don’t own my own company yet) looking for a little advice for what direction or steps I should be taking to break into the GC/property management part of this industry.