Build-to-Suit Exchanges: Rules Wealth Advisors Must Know

When a Straight Swap Isn't Enough

Most 1031 exchange conversations center on one asset trading for another. But a growing number of clients — particularly those exiting appreciated commercial real estate — face a different problem: the replacement properties they want either don't exist yet in finished form, or they need significant capital improvements to meet the client's investment thesis. That's where the improvement exchange, sometimes called a build-to-suit or construction exchange, becomes essential.

Wealth advisors who understand this structure can help clients defer substantially more tax than a standard exchange would allow. Those who don't may leave meaningful capital on the table — or worse, inadvertently guide clients into a failed exchange.

The Core Mechanics: What Section 1031 Actually Allows

Section 1031 of the Internal Revenue Code permits the deferral of capital gains taxes when a taxpayer exchanges qualifying real property held for investment or business use for like-kind real property. An improvement exchange extends this logic: it allows a client to use exchange proceeds not just to acquire a replacement property, but to fund construction or improvements on that property — provided those improvements are completed and the improved property is received before the exchange period closes.

The legal framework rests primarily on Revenue Procedure 2000-37 and the Treasury Regulations under Section 1031, which together authorize the use of an Exchange Accommodation Titleholder (EAT) — a special-purpose entity that temporarily holds title to the replacement property while construction takes place. The EAT is typically a single-member LLC established by the Qualified Intermediary (QI) or a closely affiliated party.

Two deadlines govern every improvement exchange, and neither is negotiable:

• 45-day identification window: The taxpayer must identify the replacement property within 45 days of closing on the relinquished property. In improvement exchanges, the property being identified is typically the land or existing structure that will receive the improvements — not the finished building.
• 180-day exchange period: The taxpayer must receive the replacement property — improved and with title transferred out of the EAT — within 180 days of the relinquished property closing. Construction must be substantially complete by this date. Improvements not finished by day 180 do not count toward the exchange value.

The EAT Structure: Why It Exists and How It Works

The EAT arrangement exists because of a foundational 1031 rule: a taxpayer cannot receive exchange proceeds or take constructive receipt of the replacement property before the exchange is complete. If the client simply purchased land, began construction using their own funds, and then claimed the finished building as replacement property, the IRS would view that as the taxpayer receiving property before exchange completion — disqualifying the transaction.

By parking title in the EAT, the structure keeps the property at arm's length from the taxpayer throughout the build period. The EAT enters into a construction agreement, oversees the draw of funds for construction costs, and ultimately transfers the improved property to the taxpayer once construction reaches the agreed milestone within the 180-day window.

Advisors should flag several practical considerations for clients:

• Financing complexity: Lenders are sometimes reluctant to extend construction loans to an EAT, since it is a temporary titleholder with no operating history. Early coordination between the QI, the lender, and legal counsel is critical.
• Cost overruns: Exchange funds cover only the agreed improvement costs. If construction runs over budget, additional funds cannot be retroactively treated as exchange proceeds.
• Incomplete improvements: Any portion of improvements not completed by day 180 cannot be included in the exchange value. The client will effectively receive a partially improved property and may recognize boot on the unspent or unfinished portion.

Like-Kind and Value Requirements Still Apply

Improvement exchanges do not suspend the standard like-kind rules. The replacement property — land plus completed improvements — must be like-kind to the relinquished property. For real estate, this is a broad standard: nearly any U.S. real property held for investment or business use is like-kind to any other. However, personal property and real property are not interchangeable, and improvements cannot be used to exchange into property categories that wouldn't otherwise qualify.

Equally important is the value requirement. To defer 100% of the capital gain, the total value of the replacement property (purchase price plus completed improvements) must equal or exceed the net sale price of the relinquished property. If the combined value falls short, the difference is treated as boot and is taxable in the year of the exchange. Advisors should build a conservative construction budget with appropriate contingency and confirm the appraisal methodology with the QI and tax counsel before execution begins.

Where Advisors Add the Most Value

Improvement exchanges require tighter coordination than standard deferred exchanges. The advisor's role is to quarterback the professional team — tax counsel, the QI, the lender, and the contractor — and ensure all parties understand the hard deadlines built into the IRC.

Three areas where early advisor involvement pays the highest dividend:

1. Pre-sale planning: Identifying whether an improvement exchange is appropriate before the relinquished property closes avoids the scramble of finding a suitable build-to-suit candidate within 45 days.
2. QI selection: Not all QIs have experience administering EAT structures. Advisors should confirm the QI has handled improvement exchanges, understands the Rev. Proc. 2000-37 requirements, and has relationships with lenders familiar with EAT financing.
3. Realistic construction timelines: The 180-day window sounds generous until permitting delays, material shortages, or contractor scheduling compress the actual build period. Advisors who stress-test the construction schedule before the exchange opens protect clients from the most common failure point in these transactions.

Improvement exchanges are among the most powerful tools in a 1031 practitioner's kit — and among the most technically demanding. Advisors who master the structure, and who build the right professional team around it, can deliver outcomes for clients that a standard exchange simply cannot achieve.

Disclaimer: This article is for informational purposes only and does not constitute legal, tax, or financial advice. Readers should consult qualified legal and tax professionals before entering into any 1031 exchange transaction.