My question is whether I should go ahead and buy a Class C or D property now, knowing it'll be more work, or hold and save more until I can buy more of a Class B property.

honestly I'm looking at some value add properties in I believe its the greenvale neighborhood (zip 73127)just trying to assess the area is the area closer to class c or c+? 

This is important because you don't turn a profit until you recover your cost, and your cost is what cash you put into this.Take all the cash you put into the first property (DP and paydown) and the cash you got out of it (COR), and that gives you the cash return on the first property. 

If you are only pulling $250 in cash flow with 2 doors, you want to make sure that you don't have a hot water heater, boiler, a/c, or roof coming.

Sending a Class A handyman to a Class C or D property will waste your money.

They said “prop cor” on them and had pink bands tied at the top.

If this is a C or D class area, no. 

In a C or D area, then a pay by the week sort of place..

We prefer blue collar areas that are safe so aren't interested in low c or less, high C and solid Bs are great.

Most of the old warehouses vacant and for sale for $1 around here are really tough locations so spending millions to upgrade an old building to be in a C or D class area is not that enticing.My family used to own a large warehouse for dry ice production and distribution as the neighborhood turned to crap between the 1950's and 1980's they moved into a bigger building in a nicer part of town.