When the house eventually sold, I contacted the buyers agent and explained it to him so he could be the hero with his clients and show them how they could save a bundle on their property taxes by appealing and getting that corrected!

Also, your profile says that you're a real estate agent in Canada.

Hi Shelly, I'm here in the Metro Atlanta area working as a agent/investor and I'm familiar all those counties.

All in all, this is exactly why you connect and establish a business relationship with an experienced investor-focused real estate agent who will shoot you straight. 

The best deals I find are usually the result of an agent’s lack of familiarity with the area or a very poor listing presentation.

I would also recommend joining local FB groups in your area.Hey Julia, My real estate agent just did a round of direct mail, and I have been thinking of doing the same.

It's the "house cleaning" and positioning actions one would be doing, to get things in order for a RESET. 

This is the renovation criteria I use in order to make sure the place is clean, safe and actually ready to rent. https://docs.google.com/document/d/1MreMNvXxPZy7AaqMGMFPVunQ... 

Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

STRs also avoid automatic classification as passive if rented for seven days or fewer per tenant.To maximize tax benefits, maintain detailed logs of all hours worked on activities like tenant communication, cleaning, maintenance, and marketing.