Yes, you would be separating the property between personal use and business use.
The percentage of business use would be reported in the Sale of Business Property section of the program.
The percentage of personal use would be reported in the Investment Income section of the program.
To enter an investment sale other than from a brokerage account (1099-B), follow the steps below.
Click on Federal Taxes (Personal using Home and Business)
Click on Wages and Income (Personal Income using Home and Business)
Click on I'll choose what I work on (if shown)
Under Investment Income
On Stocks, Mutual Funds, Bonds, Other, click the start or update button
Or enter investment sales in the Search box located in the upper right of the program screen. Click on the Magnifying Glass. Click on Jump to investment sales
On the next screen, click Yes
On the next screen, click No
On the next screen, choose the option for Second home and select Personal use only. Continue with the section until it completes.
If you received a Form 1099-S enter the proceeds between the business and personal use.
For how to report the home office depreciation when it was not reported on the prior year tax returns due to income limitations, I cannot answer that question with any confidence.
Contact TurboTax support to see if you can get an authoritative answer from a CPA.
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