AMT and depreciation method used on rental property

I have a rental property with a small profit which is offset by the depreciation. However, this seems to be the trigger for AMT. My rental property was put in service back in 1989 and it uses the typical MACRS straight line 27.5 years depreciation method. I've done a little digging and it seems like AMT uses a longer 40 years depreciation which may account for the differences. Is this the cause of the AMT in my case? If yes, is there a way for me to switch to the 40 years depreciation? As I mentioned before, my current rent profit is small and I will be glad to have it taxed if I can get rid of the AMT tax.

Depreciation on schedule E is not the cause of AMT on your personal return.

Hello noce forum

I used TurboTax to prepare my return and if I manually change the depreciation from 27.5 years to 40 years, the AMT amount drops to almost 0. Thus, the difference in the duration accounts for most of the AMT amount in my case. How can I change the depreciation for a rental property that is already in service (since 1989). I found IRS form 3115 - Application for Change in Accounting Method - but not sure if this is the correct form.