The qualified business Income (QBI) deduction would be the lessor of your QBI income plus qualified REIT/publicly traded partnership income times 20%, or 20% of your Form 1040 income, net of capital gains/losses and the QBI deduction. So capital losses can factor into the equation.
I'm not sure where you are seeing the unadjusted basis of qualified business property (UBIA) number, but it could easily be drawn from the cost and date put into service of the assets you entered in TurboTax. It would be the original cost of those assets, but only up util they had been used for 10 years.
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