Look at your 2018 tax return. You'll need a PDF copy of that return. In there you will find two IRS Form 4562's for the property. Both of them print in landscape format. One is titled "Depreciation and Amortization Report" and the other is titled "Alternative Minimum Tax Depreciation". You need the depreciation amount from the 2nd one. More than likely it's zero. But you need to confirm that beyond any doubt by actually looking at that 2nd form 4562 with your own two eyeballs.

Thank you!  

@opus17

@Opus 17 any idea on this one? Thanks again so much! -Dave

@Carl   So I know I owe the depreciation recapture for all the years I had a home office, even though I took it only 1 year. 

However, when I put in the amount for depreciation  in the first box, the 2nd box still say "MUST fill out this one also" etc.....

so do I put in an amount for the first one  and then Zero for the 2nd AMT one? or do I just put in the full amount for both boxes?  both regular depreciation and AMT depreciation ?? Thanks!

What does the 4562 titled "Alternative Minimum Tax Depreciation" show? If it shows a zero or is blank, enter a zero. There has to be a digit in that box, even if that digit is zero. But that digit also has to be correct.

Now I don't recall if this applies to a rental asset, but I do recall on a screen for some type of asset (maybe a SCH C business asset) where there was a "note:" on the screen telling you that if no AMT depreciation was taken, then enter the same figure that you did in the top box. So read the small print on that screen. If present, the small print matters.