If there was ever a time to be selfish in our homeland, it is now.As I have stated in another thread, sometimes a Dictator is a necessary evil to maintain control of a region.

I apologize for any grammatical errors as I am dictating this while driving 

Where to Live: The above answers may dictate you need to live in the property.

I will pray along with you that you don't find the possible long crack in the stack running into the slab you mentioned.Really won't know until we back the pipes out and peek into the wall and see what we are dealing with.I am OK with replacing the copper with copper, yes soldering a coupling every 18" (or however wide the wall opening/stud bay is which may dictate otherwise).I have to replace two 1.5" pipes from two kitchens, at the same height in parallel, so I have been wondering how the wood framing was done. 

State and local rental laws usually specifically dictate the responsibility of the landlord with regards to who is responsible for repairs of appliances that are provided by the landlord.

Quality of the asset dictates a certain price point.

This is my personal preference, but the quality of your rental is going to dictate the quality of your tenants.

Personally I would never let someone else dictate what I can and can't do.

zoning dictates what you can do with it..

The one point that is universal is as @Trevor Schmitt pointed out, that is foundational knowledge all should adopt because if you don't, your going to learn it the hard way. 3-main factors will dictate a persons capacity; (a) Personal capacity to "DO" the job.