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Hi from just answer. I'm PDtax, and can assist.
The AMT life of 40 years is correct, as is your AMT math.
I like to back into the depreciation in spots like this, but the regular depreciation doesn't seem right. It should be higher than the AMT.
Unless ADS was elected, 40 year straight line, my best guess is that this year was an adjustment for prior year bad math. I would have to assume this fixed prior year issues, and use the 39 year tables for the remainder of years you need to file.
Thanks for asking at just answer. Positive feedback is appreciated. I'm PDtax.