I am fairly certain there was no depreciation in the past years.
That's not good enough. Prove it using the guidance I provided earlier.
Once you prove beyond any doubt (not rasonable doubt, but "ANY" doubt) that you did not depreciate the property, that confirms you will need to seek professional help for your 2019 tax return. While the program does include the IRS Form 3115, it is not simple by any stretch of the imagination. You screw up the 3115 in your attempt to "fix" the issue yourself, and you'll find yourself in a never ending nightmare with the IRS from which you may never awaken. The cost of professional help is a pittance in comparison.
