You should be able to Efile your Federal and California Amended returns. Does TurboTax give a reason you can't Efile?
Yes, you can Efile your CA Amended return separately.
No, depreciation on real estate is calculated by the Cost Basis you entered and Date Placed in Service. This is calculated automatically, so you don't have to provide proof of calculations. You could save your Property Tax bill showing % allocated to Building/Land. You could also save documentation on how you arrived at your Cost Basis (which is usually what you paid).
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