1. Yes, you can take depreciation for 2019 and skip 2018 and 2017. However, you will still get dinged for depreciation when you sell the property. I would amend 2017 and 2018.
2. Yes, you should use the FMV of the property (minus land value) for depreciation.
3. You may add the prior year depreciation that you take on amended returns into your passive loss carryforwards, assuming that they go there and are not taken in the amended years return.
4. Yes, I would file amended returns for both 2017 and 2018. For TurboTax Online, simply login to your account and select “Amend a return that was filed and accepted.” If you used our CD/download product, sign back into your return and select “Amend a filed return.
5. If you are going to amend your returns, I would let the amount of suggested depreciation stay. If you do not amend then enter $0.
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