In short
A real estate investment trust, or REIT, is a company that owns income producing real estate and avoids corporate level federal tax by passing most of its income to shareholders as dividends. To keep that status, a REIT must pass asset tests, income tests, and distribute at least 90 percent of its taxable income each year. IRC §856, IRC §857
The IRS has ruled repeatedly that AI data center buildings and their core electrical and mechanical systems are real property, so they fit neatly into the REIT structure. IRS PLR 201034010, IRS PLR 201314002, IRS PLR 201537020 But the 90 percent distribution rule leaves almost no retained cash. That forces AI data center REITs to raise outside capital for every new AI campus, a major constraint when each campus can cost $1 to $2 billion. Here is how the REIT rules apply to AI data centers, common structures like UPREITs and TRSs, and why private capital and non REIT operators are challenging the model.
What is a REIT, and why is the structure used for AI data center real estate?
A REIT is a special type of corporation, trust, or association that owns real estate and avoids paying federal income tax at the company level. Instead, the tax is paid only once by the shareholders on the dividends they receive. To earn and keep this status, a REIT must satisfy several tax tests every year. IRC §856
The key REIT tests
There are three big tests that matter most for an AI data center landlord.
- Asset test. At the close of each quarter of the taxable year, at least 75 percent of the value of the REIT’s total assets must be represented by real estate assets, cash and cash items (including receivables), and Government securities. IRC §856(c)(4)(A) This is why proving that data center buildings are real property is so important.
- Income tests. At least 95 percent of gross income must come from passive sources like dividends, interest, and rents from real property. Separately, at least 75 percent must come from real estate linked sources such as rents from real property and mortgage interest. IRC §856(c)(2), IRC §856(c)(3)
- Distribution test. The REIT must distribute at least 90 percent of its taxable income (minus net capital gains) as dividends to shareholders each year. A REIT pays corporate tax on income it retains, after the dividends-paid deduction. IRC §857(a), IRC §857(b)
There are also organizational rules. A REIT must have at least 100 shareholders for most of the year. No five or fewer individuals can own more than 50 percent of the stock during the last half of the tax year. IRC §856(a)(6), IRC §856(h)
The tax advantage
A regular corporation pays tax on its income, and its shareholders pay tax again on dividends. A REIT that distributes 100 percent of its taxable income pays no entity level tax. Only the shareholders pay. For an AI data center landlord, this means more cash flows through to investors. IRC §857(b)
How does an AI data center building qualify as real property for REIT purposes?
The threshold question for any AI data center REIT is whether its buildings and systems count as real property. If they do not, the REIT cannot meet the 75 percent asset test or the 75 percent income test. Fortunately, the IRS has been remarkably clear on this question through a series of private letter rulings, or PLRs.
The inherently permanent structure test
Under the REIT rules, real property includes land and improvements to land. An improvement is an inherently permanent structure and its structural components. The 2016 Treasury regulations define an inherently permanent structure as a permanently affixed building or other permanently affixed structure. Other inherently permanent structures must serve a passive function like containing, sheltering, or protecting and must not serve an active function. Treas. Reg. §1.856-10(d)(2), Treas. Reg. §1.856-10(d)(2)
A typical AI data center building satisfies that test easily. It is a permanent shell fixed to the land. Its structural components, like raised flooring, HVAC systems, fire suppression, security systems, and the electrical distribution network that feeds power throughout the building, all support the passive function of housing and protecting the tenant’s servers. The IRS has repeatedly confirmed this in private rulings.
What the IRS private letter rulings say
Starting around 2007, the IRS issued multiple PLRs that treated AI data center buildings as real property. A PLR is a written statement from the IRS applying the tax law to a specific taxpayer’s proposed transaction. It is not precedent for anyone else, but it signals the IRS’s reasoning.
For instance, PLR 201314002, issued in October 2012, ruled that AI data center buildings with raised flooring, server cages, electrical components delivering 50 to 250 watts per square foot, HVAC systems maintaining 64 to 72 degrees Fahrenheit, and chain link fencing all qualified as real property. The ruling even said that GAAP goodwill, tenant relationships, trademarks, and favorable land leases tied to AI data center acquisitions qualified as real estate assets because they related solely to the business of leasing real property. IRS PLR 201314002
Another PLR, 201423011, went further. It held that payments under a master service agreement counted as rents from real property, even when the document was not formally a lease. The test is whether the payments are for the use of, or the right to use, real property. That ruling also said that cross connect services and certain remote hands services do not create impermissible tenant service income if they are customary in the market. JD Supra
These rulings built a solid foundation. An AI data center REIT can comfortably treat its core real estate, the building, the power distribution, the cooling, as qualifying real property.
The 2016 final regulations formalized the definition
In August 2016, the IRS and Treasury issued final regulations that codified the test for what counts as real property for REITs. The regulations use a multi factor analysis. They consider the manner in which the asset is affixed to real property, whether it is designed to be removed or to remain in place indefinitely, the damage that removal would cause to the item or to the real property, any circumstances suggesting the expected period of affixation is not indefinite, and the time and expense required to move the asset. A distinct asset that serves an active function is not an inherently permanent structure. 81 Fed. Reg. 59849
One area that became a bit trickier after the 2016 regulations is cage fencing. PLR 201314002 had treated AI data center cage fencing as real property, but the 2016 rules suggest a more careful analysis is now required. A later PLR, 201537020, reportedly took a stricter view on cage fencing. Tax alert
Still, for the core building and its major building systems, the analysis remains favorable.
The active function risk with on site power generation
Here is where the ground gets less certain. The 2016 regulations say that machinery that manufactures, creates, produces, or converts something serves an active function and is not an inherently permanent structure. An AI data center building is passive because it shelters servers. But what about a colocated on site gas fired power plant or a small nuclear reactor that generates electricity? That equipment actively creates electricity, not just distributes it.
The IRS has not issued any published ruling that directly addresses whether on site power generation assets at an AI data center qualify as real property for REIT purposes. This is a central open question for AI data center REITs, especially projects like the Fermi proposal that contemplates building multiple reactors on site. A REIT that owns both the AI data center shell and a power generation plant risks having a portion of its assets classified as non qualifying, which could blow the 75 percent asset test. 26 U.S.C. 856(c)(4) (75% asset test), 26 C.F.R. 1.856-10 (active-function test)
This issue is discussed more fully in the Open Questions section below.
How does a REIT make sure its rental income qualifies?
Once a REIT has established that its buildings are real property, it must also make sure the money it earns meets the income tests. For an AI data center REIT, the bulk of income comes from leases. But not all lease payments automatically count as good income for the REIT tests.
The two income tests in action
The 95 percent test is broad. It covers income from passive sources like dividends, interest, and rents from real property. The 75 percent test is narrower. It requires that 75 percent of gross income come from rents from real property, interest on mortgages secured by real property, and other real estate related items. IRC §856(c)(3)
For a pure play AI data center landlord that only leases buildings, all or nearly all of its income should qualify for both tests. But the details of the lease matter a lot.
What counts as rent from real property
Rent from real property includes payments for the use of, or the right to use, real property. It also includes charges for services that are customarily supplied in connection with renting similar properties. Examples are security, common area maintenance, and basic power and cooling. It also includes rent from personal property that is leased along with the real property, as long as that personal property rent is no more than 15 percent of the total rent under the lease. IRC §856(d)(1)
So if an AI data center lease bundles the use of the building with the use of backup generators and cooling towers that are structurally part of the building, those payments are likely qualifying rent. If the lease includes a large amount of movable equipment, such as standalone servers the REIT owns, the rent for that equipment must stay under the 15 percent threshold.
The 1 percent ITSI cliff
The most dangerous trap in the REIT income rules is the impermissible tenant service income rule, often called ITSI. If a REIT provides a service that is not customary for the rental of similar properties, for example managing the tenant’s servers or providing logical access to their equipment, the income from that service is ITSI. And here is the catastrophic part. If the ITSI from a particular property exceeds 1 percent of all income from that property in a tax year, then every dollar of rent from that property becomes non qualifying income. The whole property’s rent is tainted. IRC §856(d)(7)(B)
To make matters worse, the IRS treats the amount received for an impermissible service as at least 150 percent of the REIT’s direct cost to provide the service. This rule, found in IRC §856(d)(7)(D), inflates the ITSI amount and makes it easier to trip the 1 percent cliff. So a REIT must be extremely careful about what services it provides directly.
How AI data center REITs handle services, remote hands and a TRS
The IRS PLRs give clear direction on what AI data center services a REIT can perform itself and which must be spun out to a taxable REIT subsidiary, or TRS.
In PLR 201314002, the IRS said that remote hands services that do not require logical access to the tenant’s equipment are permissible. Examples include physically re seating cables, rebooting a server by pressing a button, and changing backup tapes. But any service that requires logical access, meaning the provider must log into the tenant’s system using tenant credentials, is impermissible. Those services were provided by a third party provider or by a TRS in the arrangement the IRS approved. IRS PLR 201314002
This is the fundamental reason nearly every AI data center REIT has a TRS. The TRS houses the higher value services that tenants demand, such as software monitoring, firewall management, and certain technical support. The TRS pays corporate income tax on its earnings, but it protects the REIT’s qualifying income stream.
What REIT structures are used for AI data center real estate?
Not every AI data center REIT is just a corporation that owns buildings directly. Over the years, the industry has settled on a few common structures that accommodate the needs of property contributors, tenants, and capital markets.
The UPREIT structure
The umbrella partnership REIT, or UPREIT, is the most common structure for AI data center REITs, used by Digital Realty since its 2004 IPO. In an UPREIT, the public company is the REIT itself, but it does not own the properties directly. Instead, the REIT owns a controlling interest in an operating partnership, often called the OP. The OP directly owns the AI data center real estate. The original property contributors receive units in the OP rather than cash or REIT shares at the time of contribution. Those OP units are convertible into REIT shares or cash later. REIT basics
The UPREIT structure lets a property owner contribute an existing AI data center to the REIT without triggering immediate taxable gain on the transfer. The owner receives OP units, which are a form of partnership interest, and defers the tax until those units are converted. For a growing AI data center platform, the UPREIT is a powerful acquisition tool. Digital Realty’s early portfolio, for example, was assembled from distressed facilities contributed through the UPREIT structure. GI Partners, Digital Realty Investor FAQs
The DownREIT structure
A DownREIT is similar to an UPREIT, but the REIT might own some properties directly and others through a separate partnership. It is less common for pure AI data center REITs but can be useful when a REIT acquires a portfolio from a seller that wants special partnership allocations.
The taxable REIT subsidiary, or TRS
A TRS is a regular C corporation that the REIT owns. The TRS can provide services that would be impermissible for the REIT itself, like server management or logical access. It can also hold assets that are not real property, such as a portfolio of software tools, without jeopardizing the REIT’s asset tests. But there is a hard limit. The value of the REIT’s securities in all TRS entities cannot exceed 25 percent of the REIT’s total assets. IRC §856(c)(4)(B)(ii)
Every major AI data center REIT maintains at least one TRS. Equinix, for instance, uses its TRS to sell colocation services that involve more than just passive real estate rental. The TRS pays its own corporate tax, and any dividends it pays to the REIT are qualifying income for the REIT’s tests.
The qualified REIT subsidiary, or QRS
A QRS is a corporation that the REIT owns 100 percent and that is not a TRS. The QRS is tax transparent. Its assets, liabilities, and items of income, deduction, and credit are treated as the REIT’s for purposes of this title. IRC §856(i) An AI data center REIT might use a QRS to hold title to a particular building or group of buildings for state tax reasons without adding another tax layer.
The 90 percent distribution rule and the capital crunch for AI campuses
This is where the REIT model collides with the economics of AI data centers. The 90 percent distribution requirement ensures that REITs return nearly all their taxable income to shareholders. That is great for investor income today. It is terrible for funding future growth.
Why a REIT cannot save for a new building
A normal company can reinvest its earnings. If it makes $100 million in profit, it might pay out $40 million in dividends and keep $60 million to build a new factory. A REIT cannot do that. If it has $100 million in taxable income, it must distribute at least $90 million to shareholders. That leaves at most $10 million from earnings to put toward a $1 billion AI data center campus. The REIT’s 90% distribution requirement leaves almost no retained earnings, so it must seek outside capital to buy assets and fund operations. IRC §857(a)(1), Law firm analysis
The financing treadmill
Public AI data center REITs fund growth in three ways. They issue new equity shares, they borrow money, and they form joint ventures. Each has a limit. Equity issuances dilute existing shareholders. Debt adds interest expense and leverage. Joint ventures share the economics with a partner.
Private competitors, such as private equity backed platforms and hyperscale cloud providers that build their own AI data centers, do not face the same distribution constraint. They can reinvest all their cash flow. As a result, private AI data center developers typically use much higher leverage. They use ratios of 10 to 15 times equity, compared to the 5 times or less that REITs borrow. That gives private players a structural advantage in bidding for capital intensive AI campus deals. Forbes, Applied Digital
Two examples stand out. DuPont Fabros Technology, a wholesale AI data center REIT, had strong demand and signed leases in 2008 but was forced to halt construction across all its active development sites simultaneously when the credit markets seized. The business was healthy, but the capital structure failed. Global Data Center Hub, GIP
More recently, Equinix told analysts at its June 2025 Analyst Day that it needed to raise its net debt to EBITDA leverage from 3.5 times to 4.5 times to fund an annual capex budget of $4 to $5 billion. Higher interest expense and a company restructuring called Build Bolder caused Equinix to lower its actual AFFO growth forecast to 5 to 9 percent, down from an underlying 8 to 11 percent. The stock fell 18 percent over two sessions. Chilton Capital
The math is unforgiving. An AI data center campus costs $1 to $2 billion and takes 18 to 36 months to build. The 90 percent distribution rule means a REIT must raise almost all of that money externally, and the cost of that capital directly reduces the returns shareholders see.
The rule for REITs with no income yet
There is an important nuance for REITs that have not yet started earning income. A PLR issued in 2024, 202440007, addressed a REIT with zero gross income and zero gross assets. The IRS ruled that the REIT satisfied the 75 percent and 95 percent income tests because 75 percent of zero is zero. The tests are multiplication tests, not thresholds that require actual income. Although the PLR involved a multi family property REIT and did not address AI data centers, its reasoning could apply to any newly formed REIT that has not yet acquired assets or generated income. IRS PLR 202440007
That PLR paved the way for the Fermi REIT, which went public in October 2025 with a plan to build a 5,200 acre AI data center campus near Amarillo, Texas, with a target of 11 gigawatts of total power by 2038. It had not yet earned any revenue and reported a $6.4 million loss through mid 2025. But by April 2026, satellite imagery showed no building structures completed and the company’s CEO had departed. Distilled Earth The Fermi story illustrates both the promise and the peril of the early phase REIT.
How the AI data center REIT market is shifting
The public REIT used to be the default structure for large scale AI data center ownership. That is no longer the case.
The three public AI data center REITs
As of mid 2026, there are three publicly traded REITs in the AI data center sector. Digital Realty, founded by GI Partners in 2004, operates more than 300 AI data centers globally and has a market cap over $60 billion. Equinix, which converted to a REIT in 2015, operates more than 260 AI data centers and has a market cap near $78 billion. Iron Mountain, originally a records storage company, repurposed its secure vaults into colocation facilities. DataCenterKnowledge
These REITs have delivered strong returns. AI data center REITs posted a 77 percent total return over the five years through December 2024, compared to 24 percent for the broader REIT index. Chilton Capital
The private capital takeover
Despite that performance, private capital has been acquiring and taking AI data center REITs private. In 2021, Blackstone led a $10 billion acquisition of QTS Realty Trust, a publicly traded AI data center REIT, and took it private. Around the same time, KKR and Global Infrastructure Partners took CyrusOne private. The QTS take private was driven partly by the view that a private company, freed from the 90 percent distribution mandate, could invest more aggressively in the AI data center buildout. Global Data Center Hub
Then there are the non REIT operators. CoreWeave, an AI focused cloud provider, is not a REIT. It signed a lease with Applied Digital for 400 megawatts of capacity. Hyperscalers like Amazon, Microsoft, and Google are building their own AI data center campuses, competing with REIT landlords. In 2025, the top 20 AI data center development contracts were won by companies other than established AI data center REITs, according to a Bank of America analyst. Forbes
The AI data center M&A market hit a record more than $69 billion in 2025, across more than 100 transactions. But private equity accounted for 84% of deal value since the beginning of 2024 as public companies struggled to raise the necessary funding, and in the colocation market the major players with the highest growth rates are nearly all private companies. Data Center Knowledge
So the question facing the industry is whether the public REIT structure, with its rigid distribution requirement, can remain the dominant ownership form for AI data center real estate. The market is giving at least a partial answer through its preference for private capital.
Open questions and things to watch
Several issues for AI data center REITs have no clear answer yet.
On site power generation and the active function test
This is the biggest uncertainty. An AI data center that aims to be fully AI optimized may need more than just a connection to the grid. It may need its own dedicated power plant. The 2016 real property regulations treat assets that actively create or convert something as non qualifying. A gas turbine or nuclear reactor that generates electricity would likely fall into that category. If a REIT owns both the building and the power generation plant, it risks having a substantial chunk of its assets counted as non qualifying, potentially breaching the 75 percent asset test.
Fermi’s proposed project, which would put nuclear reactors on a 99 year land lease, is the most extreme test case. But even smaller behind the meter gas plants pose the same conceptual problem. One possible workaround is to place the generation assets in a separate entity not owned by the REIT and to structure the power purchase agreement as a service, not real property rent. But that introduces its own ITSI risks. No IRS ruling has directly blessed such a structure.
Nuclear assets and REIT regulatory constraints
Even if the IRS were to treat nuclear energy assets as real property, holding a Nuclear Regulatory Commission license inside a REIT raises additional questions. The REIT rules require that the REIT itself is managed by one or more trustees or directors and that its activities are primarily passive. Operating a nuclear plant is inherently active. While a TRS could hold the NRC license and operate the plant, the TRS asset cap of 25 percent of REIT total assets would limit the scale. 26 U.S.C. § 856(c)(4)(B)(ii), IRS 2025 Form 1120-REIT instructions
The push for precedent
Currently, much of the comfort for AI data center REITs comes from private letter rulings, which are taxpayer specific. Nareit, the REIT trade association, formally asked the IRS and Treasury in May 2025 to codify some PLR conclusions on recurring issues such as preferential dividend rules, late TRS elections and revocations, and treatment of certain income under Sec. 856(c)(5)(J) into precedential guidance. The IRS did not include that item in its initial 2025 to 2026 Priority Guidance Plan released in September 2025. Tax alert
A taxpayer like Fermi, or any new AI data center REIT, may still need to request its own PLR, paying a $30,000 user fee and waiting multiple years for a ruling. Tax alert
Can the REIT model survive the AI buildout
The structural tension is not going away. AI workloads require power density that can reach 100 to 150 kilowatts per rack, and demand is growing faster than the public REITs can finance and build. Private competitors with cheaper, more flexible capital are stepping in. The take private pattern, the hyperscaler self builds, and the rise of non REIT operators all point to a shift. Whether this shift is temporary, driven by the current interest rate and equity valuation environment, or a permanent move away from the public REIT model, is the trillion dollar question.
Key takeaways
- The federal REIT rules provide a tax efficient structure for owning AI data center real estate, but they impose strict asset, income, and distribution tests.
- IRS private letter rulings have consistently treated AI data center buildings, electrical distribution, cooling systems, and other core infrastructure as real property, giving sponsors a solid foundation.
- The 2016 Treasury regulations reinforced that analysis but introduced a sharper distinction between passive structures (good) and active function machinery (bad). On site power generation assets present an unresolved risk.
- The 90 percent distribution requirement forces a REIT to raise external capital for all new development. This is a binding constraint when AI campuses cost $1 to $2 billion apiece.
- Private capital competitors can reinvest all earnings and use higher leverage, giving them a structural advantage in bidding for AI scale projects. Multiple AI data center REITs have been taken private as a result.
- A REIT that has no income yet can still qualify, thanks to a 2024 IRS ruling. But execution risks are high, as the Fermi story shows.
- The most critical open question for the future is whether an AI data center REIT can own on site power generation and still satisfy the 75 percent asset test. No one has a definitive answer yet.
Frequently asked questions
Q:What is a REIT?
A:A REIT is a company that owns, finances, or operates income producing real estate. It avoids entity level federal tax by distributing at least 90 percent of its taxable income to shareholders.
Q:Do AI data center buildings count as real property for REIT purposes?
A:Yes. The IRS has issued multiple private letter rulings confirming that an AI data center building, along with its raised flooring, electrical distribution, cooling, and fire protection systems, is an inherently permanent structure that qualifies as real property.
Q:What is the 90 percent distribution rule, and why does it matter for AI data centers?
A:A REIT must distribute at least 90 percent of its taxable income each year. That leaves almost no retained earnings. Since AI data center campuses cost $1 to $2 billion, the REIT must raise nearly all that capital externally, through stock sales, debt, or joint ventures.
Q:What is an UPREIT, and why is it common for AI data centers?
A:An UPREIT (umbrella partnership REIT) is a structure where the REIT owns properties through an operating partnership. Property contributors can put in their buildings in exchange for OP units, deferring tax on the gain. It is a tax efficient acquisition vehicle used by Digital Realty and many others.
Q:What is a taxable REIT subsidiary and why does an AI data center REIT need one?
A:A TRS is a separate taxable corporation owned by the REIT. It can provide services that the REIT cannot (like managing a tenant’s servers or providing logical access) without tainting the REIT’s qualifying income. The REIT’s investment in TRS stock cannot exceed 25 percent of its total assets.
Q:How can an AI data center REIT avoid the ITSI cliff?
A:The 1 percent ITSI cliff means that if impermissible tenant service income from a property exceeds 1 percent of all income from that property, all rent becomes non qualifying. To avoid it, REITs push high value, non customary services into a TRS and carefully monitor the direct services they provide.
Q:Are on site power plants at an AI data center REIT eligible?
A:This is not settled. Power generation equipment actively creates electricity, which likely makes it non qualifying under the 2016 real property regulations. No IRS ruling has specifically blessed an AI data center REIT structure with colocated generation. This is the biggest open risk.
Q:How many public AI data center REITs are there?
A:As of mid 2026, there are three. Digital Realty, Equinix, and Iron Mountain.
Q:What happened to Fermi, the AI data center REIT that tried to start without revenue?
A:Fermi raised $682.5 million in an October 2025 IPO to build an 11 gigawatt campus in Texas. It had no revenue and relied on a 2024 IRS ruling allowing zero income REITs to qualify. By April 2026, construction had stalled, the CEO departed, and no structures were completed.
Q:Can a REIT cure a distribution failure?
A:Yes. The deficiency dividend rules under IRC §860 allow a REIT to cure certain failures to distribute enough income by paying a deficiency dividend, avoiding outright disqualification.
Q:How are REIT dividends from AI data centers taxed?
A:REIT dividends are generally taxed as ordinary income, with a top federal rate of 37 percent. The 2017 Tax Cuts and Jobs Act added a 20 percent pass through deduction that effectively reduces the top federal rate on REIT dividends to 29.6 percent for eligible investors. IRC §199A, Angel Investors Network guide
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Junde Liu, JD, LL.M. (Taxation) candidate at UF Law. Originally published on Compute Law Blog. This article is general information and does not constitute legal advice. Reading it does not create an attorney client relationship. The reader should not act on the basis of any content here without first consulting a licensed attorney in the relevant state. Last reviewed for accuracy May 23, 2026.