What is a Qualified Opportunity Zone Business (QOZB)?

A Qualified Opportunity Zone Business is a trade or business in which substantially all of the tangible property owned or leased is Qualified Opportunity Zone business property, that meets the gross income, intangibles and financial property tests of §1397C, and that is not an excluded business.¹ Treasury Regulation §1.1400Z2(d)-1 turns those statutory phrases into numeric tests.²

The QOZB matters because of where it sits. A Qualified Opportunity Fund (QOF) can meet its 90% asset test by holding stock or partnership interests in a QOZB, acquired for cash at original issue.¹ The QOZB then builds, owns and operates the real assets. See what a Qualified Opportunity Fund is for the fund tier.

A QOZB has to pass five tests, four numeric and one categorical.^2,3 They apply on the QOF's semiannual testing dates, because the fund counts its QOZB interests as qualifying only if the business qualifies on those dates.

Each test is examined in detail in the 70% tangible property test and the gross income, intangibles and financial property tests.

Qualified Opportunity Zone business property is tangible property used in the business that meets three conditions: it was acquired by purchase from an unrelated party, its original use in the zone begins with the business or the business substantially improves it, and it is used in a zone during substantially all (90%) of the business's holding period.^1,3

• Purchase: property must be bought, not contributed, from a seller that is not related under a 20% ownership test.
• Original use: property is original use if first placed in service in the zone by the QOZB. A building vacant for at least three years also qualifies as original use.⁷
• Substantial improvement: within any 30-month period after acquisition, the business adds to the building's basis more than its adjusted basis at the start of the period. In zones made up entirely of rural areas, the threshold is 50% of basis.^7,11
• Land: land does not need to be improved separately, but it must be used in an active business; holding land for investment does not qualify.
• Leased property: leased tangible property can count if the lease is at market rates. Original use does not apply to leased property, and related-party leases have extra limits.⁷

See the original use requirement and the substantial improvement test.

A QOZB can hold cash for up to 31 months under the working capital safe harbor, and up to 62 months if it uses overlapping or sequential plans.^5,6 During the safe harbor period, the cash counts as reasonable working capital, the property being built counts toward the 70% test, and income earned on the cash counts toward the 50% gross income test.

Three conditions apply. The cash must be designated in writing for acquiring, building or substantially improving tangible property in the zone. There must be a written schedule consistent with ordinary start-up of a business. And the money must actually be spent substantially as planned.⁵

Two extensions exist: tolling for delay caused by a government action on a completed application, and up to 24 more months if the zone is in a federally declared disaster area.⁵ Treasury's Notice 2026-55 asks for comments on whether a QOZB should be allowed to modify an existing plan, so expect rules here to evolve.¹² More in the working capital safe harbor.

Owning and leasing real estate can be an active trade or business, but merely entering into a triple-net lease is not.⁸ A triple-net lease is one where the tenant pays taxes, insurance and maintenance in addition to rent.⁸

The regulations give two contrasting examples. A landlord that leases an entire building to one tenant on a triple-net basis is not engaged in an active business, even with an on-site office staffed to handle lease issues. A landlord that leases part of a building triple-net but actively manages and operates the rest through its own employees is.^8,9 Where a business does not clear the line, its rental income fails the 50% gross income test.

A data center QOZB qualifies most cleanly when it operates the facility rather than handing it to a single tenant on a triple-net lease.¹⁰ No authority addresses hyperscale data center leases specifically, so the analysis rests on the general rule and its examples.

Equipment raises a second issue. Servers and networking gear owned by a tenant are the tenant's property, not the QOZB's, and they do not help the QOZB's 70% test. Equipment the QOZB owns does count but has a short life, so plan replacements. See data centers in Opportunity Zones and powered shell and triple-net data centers.

If a QOZB fails, the QOF's interest in it stops counting toward the fund's 90% test, which can produce a fund-level penalty.² The regulations give a one-time six-month cure period for a business that fails the 70% tangible property requirement, letting it fix the problem before the fund is affected.⁴ Repeated failure can threaten the fund's status and, with it, investors' benefits.