My only job is working on our rentals/finding tenants. In 2018, I had the 750 hours. I will not have those hours in 2019. Can I be a Pro one year and not the next?

Yes, you can, but read about it in this non-technical article from a well-respected accounting source, because there's more to it than you think

• https://www.thetaxadviser.com/issues/2017/mar/navigating-real-estate-professional-rules.html
  
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Thank you for that link.  There is a lot to it and I decided not to be a pro!