If you aggregate it will be the entire enterprise however, the property that is sold will allow any passive loss in the year of sale outside of the QBID aggregation.
Passive losses for a QBI business (from 2018 forward) will be tracked until the year the loss is included in taxable income. This is included in the Instructions for Form 8995-A.
You can "group" (or aggregate) your rental properties (treat them as a single enterprise) for the purposes of Section 199A (the QBI deduction).
See Rev. Proc. 2019-38
You cannot "group" (or aggregate) your rental properties to avoid the passive activity loss rules unless you qualify as a real estate professional and grouping them would allow you to meet one of the material participation tests.
See Treas. Reg. §1.469-9(g)(3)
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