One of which is trainers utilizing my space and pay me rent for time slots to teach classes.

In some areas the cities have web portals where you can obtain the info, but that doesn't seem to be the case for Greenville, NC.

I took a quick peek at your web site and noticed you do both on market and off market real estate, and you've coached investors to help them build their business. 

There are plenty of mortgage calculators for free on the web. 

I'm even more interested in the pain points HoA managers experience when trying to conduct operations via the web.

Doug, congrats on getting to this stage.I am not an agent or a lawyer, but check your state dept. of real estate web site.

I want to own my properties in separate LLC's for asset protection, but operate them through one "business" name that I can use for all accounts/transactions (think: Google Voice, email address, web domain, one credit card, paying all the contractors, property manager, etc.) and that one "business" is an LLC separate from the property LLC's. 

It would be much cheaper to hire a CPA that knows what they are doing.See the IRS web site for additional details https://www.irs.gov/businesses...

Are you not transferring the weight of the loaded swing to the glue that binds the added plywood to the webbing? 

I list on Zillow through a online web portal I belong to.