A 721 exchange lets you contribute appreciated real estate to a partnership in exchange for partnership units without triggering an immediate capital gains tax bill. The name comes from Internal Revenue Code Section 721, which provides that no gain or loss is recognized when property is contributed to a partnership in exchange for a partnership interest.1Office of the Law Revision Counsel. 26 U.S. Code 721 – Nonrecognition of Gain or Loss on Contribution In practice, these transactions almost always involve a Real Estate Investment Trust using an UPREIT structure, where you swap a building or portfolio for units in a large, diversified operating partnership. You get tax deferral, diversification, income from day one, and an eventual path to liquidity that direct property ownership can’t offer.
How the UPREIT Structure Works
A publicly traded REIT usually doesn’t own real estate directly. It owns a controlling interest in a subsidiary called an Operating Partnership (OP), and the OP holds the properties. The REIT acts as the general partner and runs the portfolio.
When you do a 721 exchange, your building goes into the Operating Partnership. In return, you receive Operating Partnership Units, commonly called OP Units. The units are sized to match the fair market value of what you contributed, and they typically pay distributions equal to the dividends on the REIT’s common stock. Your income stream begins right away.
Because you exchanged property for a partnership interest rather than selling it, the transaction qualifies for non-recognition treatment under Section 721.1Office of the Law Revision Counsel. 26 U.S. Code 721 – Nonrecognition of Gain or Loss on Contribution The capital gain that built up during your years of ownership stays deferred. You haven’t avoided the tax. You’ve pushed it forward to a future event.
Lock-Up Periods and Converting to REIT Shares
OP Units are contractually convertible into common shares of the publicly traded REIT, usually on a one-for-one basis. That conversion is what turns an illiquid real estate holding into shares you can sell on a stock exchange. It’s also the moment the deferred tax bill comes due, so most contributors hold their units for years before converting.
You can’t convert immediately. Partnership agreements include a lock-up period, typically around 12 months, during which the units can’t be redeemed or exchanged. Some deals negotiate shorter or longer lock-ups depending on the contributor’s leverage and the REIT’s preferences.
Once the lock-up expires, you can redeem OP Units for cash equal to the market value of the equivalent REIT shares, or exchange them directly for REIT common stock. Most partnership agreements let the REIT choose whether to satisfy the redemption in cash or shares. Either way, the conversion triggers recognition of the deferred capital gain.
One useful wrinkle: your holding period in the OP Units includes the time you held the original property, because the tax code lets the holding period tack when property is exchanged for a partnership interest in a non-recognition transaction.2eCFR. 26 CFR 1.1223-3 – Rules Relating to the Holding Periods of a Partnership Interest If you owned the building for ten years before contributing it, your units are already long-term holdings from day one.
What Qualifies for Tax Deferral
Section 721’s non-recognition treatment has boundaries. The contribution has to involve property in exchange for a partnership interest. If you receive a partnership interest in exchange for services, the fair market value of that interest is immediately taxable as ordinary income.3eCFR. 26 CFR 1.721-1 – Nonrecognition of Gain or Loss on Contribution This matters in deals where a property owner also provides ongoing management services. The property portion qualifies for deferral; any interest attributable to services does not.
The partnership also has to keep operating as a business after the contribution. Section 721 isn’t a way to liquidate assets through a shell entity. The UPREIT structure satisfies this easily because the Operating Partnership is an active real estate business.
How Mortgage Debt Can Trigger Taxable Gain
The most common trap involves debt. When you contribute a mortgaged property, the Operating Partnership assumes your loan. Under the partnership tax rules, any decrease in your individual liabilities because the partnership took them over is treated as a cash distribution to you.4eCFR. 26 CFR 1.752-1 – Treatment of Partnership Liabilities
That deemed distribution doesn’t automatically create a tax bill. You also pick up a share of the partnership’s total liabilities after the contribution, and that increases your basis. The problem is when the mortgage relief exceeds your new share of partnership debt. If the net deemed distribution is larger than your adjusted basis in the OP Units, the excess is taxable gain.5eCFR. 26 CFR 1.731-1 – Extent of Recognition of Gain or Loss on Distribution
Partnership agreements in UPREIT transactions routinely include specialized debt allocation clauses that shift enough of the OP’s total liabilities back to the contributing partner to prevent an excess distribution. These provisions are negotiated before closing and matter most when the contributed property carries a high loan-to-value ratio.
The Disguised Sale Trap
If you contribute property to the Operating Partnership and then receive a cash distribution shortly afterward, the IRS may recharacterize the whole thing as a taxable sale. Treasury Regulations create a rebuttable presumption that any property contribution and cash distribution occurring within two years of each other constitute a disguised sale.6eCFR. 26 CFR 1.707-3 – Disguised Sales of Property to Partnership; General Rules Transfers more than two years apart get the opposite presumption. They’re assumed not to be a sale.
Overcoming the two-year presumption means proving the cash distribution had nothing to do with the property contribution. Distributions from operating cash flow, or distributions made pro rata to all partners, are easier to defend. Distributions that look like purchase price payments, especially ones discussed during contribution negotiations, are exactly what the rule is designed to catch.
Basis and Built-In Gain While You Hold the Units
Your tax basis doesn’t reset to fair market value when you contribute. You carry over the same adjusted basis you had in the property, and that becomes your outside basis in the OP Units. The partnership takes the property with the same basis, called the inside basis. The gap between the property’s fair market value and this inside basis is the built-in gain: the deferred profit that will eventually be taxed.
The tax code requires the partnership to track this built-in gain and allocate any future income, gain, loss, or deduction related to the contributed property specifically to you as the contributor.7eCFR. 26 CFR 1.704-3 – Contributed Property This keeps other partners from absorbing tax consequences that belong to you, and it can affect how much tax you owe each year while holding the units. The partnership agreement specifies the allocation method, and it’s worth reviewing before you sign.
Tax Consequences When You Convert or Cash Out
The deferred gain is recognized when you convert OP Units into REIT shares or redeem them for cash. The conversion is treated as a disposition of your partnership interest. You recognize capital gain equal to the difference between the fair market value of what you receive and your outside basis in the OP Units.
Capital Gains Rates
Because your holding period in the OP Units tacks back to when you acquired the original property, the gain almost always qualifies for long-term capital gains treatment. For 2026, long-term capital gains are taxed at 0%, 15%, or 20% depending on your taxable income.8Internal Revenue Service. Topic No. 409 – Capital Gains and Losses Most UPREIT contributors land in the 15% or 20% bracket.
Depreciation Recapture
A portion of the gain may be taxed at a higher rate. Any gain attributable to depreciation previously claimed on the contributed property is classified as unrecaptured Section 1250 gain and taxed at a maximum rate of 25%.9Office of the Law Revision Counsel. 26 U.S. Code 1 – Tax Imposed If you owned a commercial building for decades and claimed substantial depreciation, this piece can be a meaningful chunk of the total bill.
The 3.8% Net Investment Income Tax
Higher-income taxpayers owe an additional 3.8% surtax on net investment income. The tax applies to the lesser of your net investment income or the amount by which your modified adjusted gross income exceeds $200,000 for single filers or $250,000 for married couples filing jointly.10Office of the Law Revision Counsel. 26 U.S. Code 1411 – Imposition of Tax Gains from converting OP Units count as net investment income. For a contributor with a large built-in gain, the combined effective rate on conversion can reach 23.8% on the long-term gain portion and up to 28.8% on the depreciation recapture portion.
Step-Up in Basis at Death
Contributors who hold their OP Units until death can eliminate the deferred gain entirely. Under Section 1014, the basis of property acquired from a decedent is stepped up to fair market value at the date of death.11Office of the Law Revision Counsel. 26 U.S. Code 1014 – Basis of Property Acquired From a Decedent Heirs inherit the OP Units with a fresh basis equal to current value, and the built-in gain accumulated over the contributor’s lifetime disappears. This is often the primary motivation for older property owners choosing a 721 exchange over a sale.
Using a 1031 Exchange as a Bridge
Most individual property owners can’t contribute directly to an UPREIT. Operating Partnerships typically acquire institutional-grade commercial real estate, and the minimum property values that get a REIT’s attention are well beyond what many individual investors own. The workaround is a two-step process using a Delaware Statutory Trust (DST).
First, you sell your property and use a Section 1031 like-kind exchange to reinvest the proceeds into a DST that owns institutional-quality real estate designed for an eventual UPREIT contribution. The IRS treats beneficial interests in a qualifying DST as direct ownership of real property, making them eligible for 1031 exchange treatment under Revenue Ruling 2004-86.
Second, when the DST reaches the end of its investment cycle, the REIT acquires the DST’s property through a 721 exchange. Your fractional DST interest converts into OP Units. Tax deferral carries through both legs. DSTs structured for this purpose tend to have shorter holding periods than traditional DSTs, often around two years before the 721 conversion.
The bridge opens the UPREIT path to owners of smaller properties who wouldn’t otherwise qualify, and it means you can defer the gain from selling a single-family rental all the way into a publicly traded REIT portfolio.
How a 721 Exchange Differs From a 1031 Exchange
The two are often compared, but they serve different goals.
- Liquidity. A 1031 exchange locks you into another physical property. A 721 exchange moves you toward OP Units that eventually convert into publicly traded REIT shares you can sell on the open market.
- Timing pressure. A 1031 exchange requires you to identify replacement property within 45 days and close within 180 days of selling the relinquished property. A 721 exchange has no equivalent countdown. The contribution is negotiated directly with the Operating Partnership on whatever timeline the parties agree to.12Internal Revenue Service. Like-Kind Exchanges Under IRC Section 1031
- Management. After a 1031 exchange, you still own and manage a building. After a 721 exchange, you’re a passive investor. The REIT handles operations, leasing, maintenance, and capital expenditures.
- Debt handling. A 1031 exchange requires you to take on equal or greater debt on the replacement property to avoid taxable boot from mortgage relief. In a 721 exchange, the large pool of debt across the entire Operating Partnership makes it easier to allocate enough liabilities to you through partnership agreement provisions, though the calculations are more complex.
- Diversification. A 1031 exchange concentrates your investment in a single replacement property. OP Units give you exposure to every property in the REIT’s portfolio from the moment of contribution.
- Scale. Section 1031 works for most investment real estate, from duplexes to office towers. Direct 721 exchanges with major REITs generally require institutional-grade properties, though the DST bridge opens the door for smaller investors.
Neither is inherently better. A 1031 exchange fits when you want to keep managing real estate and trade into a specific property. A 721 exchange fits when you want to exit active management, diversify, and create an eventual path to liquidity, especially if you plan to hold through death and pass the stepped-up units to your heirs.