Most homes can be broken down into class A, B, C, D areas for the quality of the neighbor hood.

You are right that you have to know what you're looking at in comps because two identical row homes can have or lack features that make a huge difference to the user's quality of life.

Good point @Joe Fairless a few quality connections is a lot more valuable than spamming out your cards.

Maybe we can chat some evening, or meet up the next time I come to town (I'm one of those out of area investors in search of quality and cash flow).  

Knowing your market, rents, tenant expectations of the quality of a unit, etc. and key to being successful.

Galvanizing copper is a chemical impossibility.Projected lifespan of galvanized piping is typically projected at 60 years, but it can be less or more depending on the water quality of the source.Copper is generally projected at 80 years but same caveat.Lifespan of plastic is for all practical purposes, infinite. 

I would like to learn about analyzing, purchasing and managing larger Multi Families and or Apartment complexes.Can anyone recommend any self learning books or courses...preferable audio format....that I can study to get my feet wet.Thanks in advance

Can I use one of the units for a year as a commuter residence (live there 4 days a week) and quality?

Not all cash flow is created equal ... the $2200/month SFR will tend to be one higher quality tenant, the $3000/month triplex will tend to be 3 lower quality tenants.

You can often find very cheap and good quality MHs if you know how and where to look.