Opportunity Zone data center development timeline

Usually three to seven years from site control to a building drawing full power, depending mostly on how quickly the utility can deliver capacity. Vertical construction is the shorter part. Epoch AI's tracking of recent gigawatt-scale campuses found 1 to 3.6 years from start of construction to 1 GW of power, and NTT Facilities puts the traditional design-and-construction period for a large data center at 3 to 4 years.^3,4

Power is the long pole. Dominion Energy said in 2024 that connecting data centers above 100 MW could take one to three years longer than before, for total waits of up to seven years in Northern Virginia.² For on-site or co-located generation, Lawrence Berkeley National Laboratory (LBNL) reports that the median time from interconnection request to commercial operation exceeded four years for generators built in 2018 to 2024, up from under two years for those built in 2000 to 2007.¹ For more on the grid side, see power interconnection for Opportunity Zone data centers.

Five clocks matter, and they start at different times. Some run for the investor, some for the operating business and some for individual buildings.

• 180-day investment period. An investor generally has 180 days from the date of a sale to invest the gain in a Qualified Opportunity Fund (QOF). For §1231 gains the period starts on the date of sale, and partners in a pass-through can elect other start dates, including the due date of the entity's return.⁸
• QOF 90% asset test. The fund must hold at least 90% of its assets in Opportunity Zone property, averaged over two semiannual testing dates.¹²
• Working capital safe harbor. A Qualified Opportunity Zone Business (QOZB), the operating company that owns the project, may treat cash as reasonable working capital for up to 31 months under a written designation and schedule, and up to 62 months with overlapping or sequential plans for multiple cash infusions.⁶
• Substantial improvement. A purchased existing building must be improved by more than its starting basis within any 30-month period, or by more than 50% of its basis in a wholly rural zone.^7,13
• Investor holding periods. For investments made on or after January 1, 2027, the deferred gain is included in income at the earlier of a sale or five years after the investment, with a 10% basis step-up (30% in a rural fund). After 10 years, the investor can elect to step basis up to fair market value on sale.⁹

Poorly, unless capital is staged. If the QOF raises all its equity at month 0 and the utility delivers power at month 48, the cash sits idle well past the first 31-month plan. The figure below overlays an illustrative 46-month schedule on the safe harbor periods.

Three points stand out. First, land, power studies and deposits are spent early, which suits the safe harbor. Second, the largest outlays (construction) fall in months 18 to 42, straddling the end of the first plan. Third, a ground-up building on raw land meets the original use test, so the 30-month substantial improvement clock applies only if the project buys and converts an existing building.⁷ See the working capital safe harbor and the substantial improvement test.

Raise and deploy equity in tranches that each fit a written plan. The regulations allow overlapping or sequential safe harbor plans up to 62 months from the first infusion, but each needs its own written designation, schedule and non-de minimis cash infusion, and the plans must form an integrated whole.^6,5

Staging affects investors too. Each investor's 180-day period runs from its own gain, so a fund with several closings may take money over many months. Capital called later starts a later five-year and 10-year clock for that investor. See how a data center Opportunity Zone fund works.

Some delays toll the safe harbor and some do not. The regulations toll the period when the delay is attributable to waiting for a government action on a completed application, but only where no other action could be taken to advance the project during the delay. A QOZ in a federally declared disaster area can receive up to an additional 24 months.⁵

Whether a utility's study queue or its construction schedule counts as a governmental permitting delay has not been addressed in guidance. Many utilities are investor-owned companies, not government bodies, so a project should not assume tolling. Notice 2026-55 asks for comments on whether a QOZB should be allowed to modify an existing working capital plan, so this area may change.¹⁰

The project shifts from build to operate, and the QOZB must keep passing its tests every testing date. JLL reports tenants are signing leases for 2028 deliveries, which suggests that a project energizing on schedule can have its revenue in place by years four or five.¹¹

• Year 5: investors owe tax on 90% of the deferred gain in a standard fund (70% in a rural fund), so many projects plan a refinancing or distribution around this date.⁹
• Years 5 to 10: IT and some mechanical equipment is replaced. Replacements must be bought from unrelated parties and placed in service in the zone to count as qualifying property.
• Year 10 and after: the investor can sell the QOF interest and elect basis equal to fair market value. See Opportunity Zone exit strategies after 10 years.

For the investor-level dates in one place, see Opportunity Zone key dates and timeline. The 30-year cap fixes basis at fair market value on the 30th anniversary, and Treasury has asked for comments on how that election works without a sale.¹⁰