Even if they did not meet your other, non discriminatory criteria, they might also fit into a protected class.  If

1) and 2) are different types of entities with different tax classifications because they are used for different purposes!

So maybe I do care a little bit about the classification

(This is often the case for small landlords.)You would have to issue them for your flips though, and/or if you did actually fall under the classification of a "Real Estate Professional". 

You might find some answers in this threadhttps://www.biggerpockets.com/forums/311/topics/174373-atlanta-neighborhood-classification-question

However, my CPA would like all of the details in case he disagrees with a classification.  

I wound up networking with some locals (investors & contractors) and got them to visit the properties for me to get photos, estimate cost of rehab and to give me the scoop on the neighborhood classification.  

For example, you can buy different home types (SFR, multi-family, apartments) or you can buy units in various property classification types (A,B,C).  

The problem is the appraiser, siting mold growth on the floor, put a C5 classification on the property and made it subject to repair and re-inspection.

I need help ASAP filing my tax classification for my LLC as an S Corp but have no idea what I am doing.