I use math as my distinguishing factor when I decide to invest. 

This is why its important to clearly distinguish your LLC as a separate entity from you by keeping assets, records, expenditures, etc... separate.I am not a lawyer nor an insurance agent.

@Sam Frank the point about commercial loans for 5 units or more comes from the fact that the industry distinguishes a multi unit building with four units as residential.

And as you and @Monolo D. both think card application approvals are automated and don't distinguish between Individual and Authorized User accounts, I'm going to give it a try and apply for a new card now.  

Originally posted by @Joel Owens:Tons of properties out there.I could not find any good deals since September, or they were gone before I noticed them.Maybe I am not working with the right agent... or I am not looking hard enough... or it's just me who cannot distinguish a good deal when it's in front of me until it's gone.

It is within this context that I wish to extend my appreciation to Engineered Tax Service, and in particular, Julio Gonzalez, a distinguished member of our BiggerPockets community.As an aspirant in this dynamic field, I am compelled to explore how Engineered Tax Service, under Julio's guidance, can illuminate the path towards not only meeting but exceeding the stringent requirements of lenders.

And we also need to distinguish between for-profit room rentals and cost-sharing roommates, which is a big can of worms that I don't want to debate.

what are the distinguishing characteristics between class C, D , Depressed and a war zone?.  

The key is being able to distinguish the % dedicated to investment (work use). 

I have found it is easier than I thought to distinguish the action takers from the bench warmers.