In order to meet the 1% or 2% rule, someone might need to buy a property in a class C or C- neighborhood.

People often make statements as matters of fact such as "wholesaling goes on Schedule C", or "wholesaling is subject to self-employment tax", or "wholesaling is not allowed in CA", and people take that are run with it as fact.

I'd maybe just qualify it to say that over the medium/long term one should be able to bet on appreciation (provided there is inflation) for all US housing stock in total, but of course that doesn't mean it holds in all individual markets (back to @Llewelyn A.'

Infrastructure and job centers (such as UMD and a few govt agencies) are reasons I would bet on Hyattsville.

You can bet on that.

You bet! One

Duplexes in this area can be associated with Class-C or lower areas as there are a plethora of SFH available in the area at decent price points or prospective tenants will choose from the many nice apartment complexes that have been built in the area since I’ve been here. 

Class A, B, C or D neighborhood?

We were told to first open a C or S Corp. and then an LLC (LLP?).

Some of my investment properties may be in areas that many feel are bad areas, War Zones, or C or D Class properties which is great for me and my investors because I am able to continue to scoop them up for pennies on the dollar.