How do I find total depreciation for a property investment that I sold this Year? I first used it as a rental in 1991 and I have been using turbo tax since then.

It should be on your 2020 depreciation worksheet. If you don't have access, you can work backwards through prior year's returns until you do have an amount.

 

For every year, except the first and the last, the depreciation percentage will be about 3.636% of the depreciable basis of the building. The first and last years will have a different percentage, depending on the dates placed in service and sold.