Am I a business or passive investor?

[Travis C.]

I probably need to quit doing my taxes on TurboTax and just get a CPA at this point, but I am a "mom and pop" single family home rental property investor with now 20 properties. I hold title currently to all my properties under my own name (many have conventionally financed mortgages) and I have a full-time day job at the bank. I do self-manage my properties and I dispatch trusted vendors as needed to make repairs etc. 

I've always checked the box in TurboTax saying that this is passive income, as I have always considered it to be just that (versus a full-time qualified business). I do have not issued 1099 MISC's to contractors either, as it had been my understanding that I needn't do that as a "passive investor." 

Any thoughts on my approach? Am I an actual business that needs to do things more formally at this point? Certainly don't want to cause myself tax issues, but I'm not claiming to be a qualified business seeking higher deductions either. 

Thoughts?