For a triplex you may need to factor in lawn care and snow removal..unless you are planning to do that yourself or pass that on to your tenants.

The construction costs of the building would likely be paid off in 4-5 years.I believe our lower property taxes possibly give us a competitive advantage redeveloping ourselves versus selling to an outside developer.Here's my question/idea.To keep the land portion of our property taxes at the artificially low rates could we retain ownership of our respective parcels while forming a separate LLC or partnership that would construct and own the building? 

Just playing devils advocate to those who say the market is artificially stimulated and many real estate buyers are foreign investors and hedge funds looking for yield.

I have a full-time teaching job, own a lawn care business and invest in real estate. 

You essentially have 14 lawns to cut. 

After the cats were released. the would not enter the trap again so eventually I began catching things I did not want.I found a kitten trapped in a sewage stack that had been broken loose by the lawn guys.

Historic properties sometimes have tax benefits (tax credits, artificially low property tax rates, etc.).

Lawn care?

Lawn maintenance seems very low for South Carolina unless there is no yard and it's just landscaping.

Odds are you're also paying water (it's hard to get those metered separately with a 5th meter of the lawn) and *might* be paying for trash or at least a dumpster fee.