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. 

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.

Any suggestions/recommendations for reliable and quality contractors and title companies is greatly appreciated.

If they are doing things to destroy your house, that kicks it up a notch on how your respond.What kind of repairs from the water damage is outstanding?

This can also mean a lower quality tenant depending on how low the rent ends up being. 

@Young Moon - Multi-Family properties in Richmond are varied in quality.

Not willing to pay the taxes in full due to the quality of the deal...thoughts appreciated.Property is in Ohio...

With a copy of his deployment orders also get contact info of his 'rear detachment' commander in the event he doesnot pay rent.Soldiers are required to pay their rent and other outstanding bills.