.- So, a Class C rental, should be maintained to Class C standards, not Class A.--- You can go up ONE Class (maintain Class B to Class A standards), but not more than that.

a couple of my clients have liked the hybrid approach, meaning a long term standard tenant on one side and an MTR on the other.  

And as a result the title insurance industry, the brokerage industry and the investment industry will radically change.

You'd have get get fire fighting insurance and if you don't have it, you'll just burn down. 

I  have an insurance agent that handles my cars and rental properties.

IMO, no amount of insurance savings will generate a reasonable ROI on replacement windows.

Quote from @Maya Jones: What are good umbrella insurance companies?

If you have enough money to buy and update the place to get it up to market rent standards, then I would totally buy it.Inspections went so so, the triplex needed more work than the apartment with the business space on the bottom.

Well, if you buy & renovate a property in Class D area to Class A standards, what Tenant Class will actually rent it?

If you set your standards at 625, you keep your standards at 625 no matter what.