When a Standard 1031 Does Not Work
A standard 1031 assumes a simple trade. Sell Property A, identify Property B within 45 days, close within 180. Tax deferred.
That assumes there is a Property B on the market matching your number and your thesis. Often not.
Scenarios where the standard mechanic breaks:
- You sold a $600,000 fourplex. The only replacements at $600,000 are junk, or they are $900,000 and you would need to leverage up significantly.
- You already own land and want to build a new rental on it using exchange proceeds.
- You want to demolish and put up something purpose-built.
- You need specific improvements the seller will not make before close.
You cannot spend proceeds on a property you already own. You cannot take proceeds from the QI to pay a contractor after closing (constructive receipt). You cannot close on a half-built property and count post-180-day construction toward exchange value.
The build-to-suit (also called improvement or construction exchange) solves this. It lets you use 1031 proceeds to fund construction on the replacement before you take title.
How a Build-to-Suit Works (Parking + Construction)
In a standard exchange, the QI holds proceeds in trust, then wires them at replacement close. The QI never takes title.
In a build-to-suit, a separate entity called an Exchange Accommodation Titleholder (EAT) actually takes title while construction happens. This is called “parking” the property:
- You sell Property A. Proceeds go to your QI.
- Before day 45, you identify the replacement (land plus planned improvements).
- The EAT buys the replacement using funds routed through the QI.
- Construction begins. Funds flow from the QI to the EAT to the contractor as work progresses.
- Before day 180, the EAT transfers title to you. Whatever has been built by that date counts toward exchange value.
The EAT is a separate legal entity (usually an LLC set up by your QI) that exists solely to hold title during the build. You cannot take title yourself during construction because improvements to property you already own do not count as like-kind replacement under Section 1031.
The Role of the EAT
The EAT is governed by IRS Revenue Procedure 2000-37, which defines the safe harbor for parking.
Key points:
- The EAT must be independent. Not you, your spouse, your partner, or an entity you control. If the IRS finds you effectively controlled the EAT, the parking fails and the whole exchange becomes taxable.
- The EAT actually owns the property. It pays property taxes, signs construction contracts (funded through the QI), and carries insurance.
- The EAT cannot hold forever. Under Rev Proc 2000-37, maximum is 180 days from when it took title. In forward-parking structures, this runs parallel to your 180-day exchange clock.
- EAT fees are separate from QI fees. $5,000 to $15,000 for a single parking arrangement.
Every reputable QI that offers build-to-suit has a pre-built EAT structure. You do not set this up yourself.
The 45-Day Identification Problem
The 45-day rule still applies. But you are not identifying an existing rental. You are identifying a property plus the improvements you plan to build.
Your day-45 letter needs legal address, description of planned improvements (new construction of a 2-unit duplex, 1,800 square feet, 3 bedrooms per unit), and enough specificity that the finished property is recognizable as what you identified.
If you identify “vacant lot at 123 Main Street” on day 45 and the EAT builds a fourplex by day 180, the IRS could argue the fourplex is not what you identified. Exchange could be partially or fully disqualified.
Fix: work with an architect and contractor before day 45 to produce a description detailed enough to survive review. Best build-to-suit candidates are investors who already have plans ready. Identifying a brand new project in the first 45 days after a sale is a recipe for sloppy identification.
The 180-Day Construction Window
The construction window runs until the EAT transfers title to you. In forward parking, this overlaps with your 180-day exchange deadline. From the day you close Property A, you have 180 days to close on the land via the EAT, get permits, complete construction, and have the EAT transfer title.
Realistic scope:
- Major rehab (new roof, kitchens, baths, flooring): 120-150 days with contractor lined up.
- Garage-to-ADU conversion: 90-150 days depending on permits.
- New duplex on buildable land with pre-approved plans: tight but feasible in 150-180 days if framing starts within 30 days of land close.
- New single-family from scratch: very tight. Needs permits in hand and contractor engaged.
What does not fit: ground-up new construction in slow-permit jurisdictions (California coastal, NYC, most of the Northeast), anything contingent on slow utility hookups.
If you want to do a build-to-suit, line up permits, plans, and contractors before you sell Property A. Do not sell first and figure out construction second.
Even if construction does not finish by day 180, the exchange can still close. You take title to whatever is built by then. Construction after day 180 does not count toward exchange value, so more of your proceeds end up as boot.
Basis Calculation - What Counts as Exchange Value
Your exchange value is not the final appraised value. It is what the EAT paid for plus what got built by day 180.
Example. Sell Property A for $500,000 net. QI holds $500,000.
- Day 30: EAT buys lot for $150,000. Remaining: $350,000.
- Day 60: Foundation. $50,000 paid. Remaining: $300,000.
- Day 120: Framing, roof, rough plumbing, electrical. $200,000 paid. Remaining: $100,000.
- Day 180: 80 percent complete. $80,000 more paid. Remaining: $20,000. EAT transfers title with construction incomplete.
Exchange value: $150,000 + $50,000 + $200,000 + $80,000 = $480,000.
Remaining $20,000 is cash boot, taxed at capital gains plus recapture rates. Work after day 180 still increases basis but does not count as exchange value.
Why build-to-suit investors aim to spend every dollar by day 180 and finish a few weeks early. Running to the wire creates boot you did not plan for.
Cost and Complexity - Fees vs Tax Deferred
Build-to-suit is the most expensive form of 1031.
Standard 1031: QI $750 to $1,500.
Build-to-suit: QI $1,500 to $3,000. EAT $5,000 to $15,000. Legal $1,500 to $5,000. Double-closing title $4,000 to $10,000. Draw fees $150 to $500 per draw, 4-8 draws. Total: $12,000 to $35,000.
On a $500,000 exchange, $15,000 in fees is 3 percent. On $1,500,000, $25,000 is under 2 percent.
A $500,000 sale with $200,000 gain and $60,000 accumulated depreciation generates roughly $30,000 federal capital gains plus $15,000 recapture. $45,000 federal minimum.
Build-to-suit math works when deferred gain is significantly larger than fees (5x or more), you have a real construction plan that fits 180 days, and the replacement is genuinely better than anything off the shelf.
When It Makes Sense
Makes sense when: you sold an appreciated property and the only affordable replacement needs work; you want to develop land bought with exchange proceeds; you want a specific type not available retail; you have control of timeline and construction risk.
Does not make sense when: the exchange is small (below $300,000 of gain, fees eat the benefit); you are in a slow-permit jurisdiction; you do not already have plans, permits, or a contractor.
Real Example - Duplex Build from Exchange Proceeds
Investor: 6 PM-managed rentals across Tennessee and Georgia. Sold a 12-unit Chattanooga apartment building for $2,100,000 net. Basis $900,000, gain $1,200,000, accumulated depreciation $400,000.
Tax without a 1031: roughly $180,000 federal capital gains, $100,000 recapture, $45,000 NIIT. Total: $325,000.
Standard 1031 problem: wanted a small build-to-rent duplex community. Existing inventory was overpriced or rough.
Build-to-suit path:
- Sells Jan 15. Proceeds to QI: $2,100,000.
- Day 20: signs contract with builder for 4 duplexes (8 units) on builder-controlled land. Plans pre-approved.
- Day 45: identifies via EAT. Describes 4 duplexes by legal description, unit count, square footage, and plans.
- Day 60: EAT buys land for $400,000.
- Days 60-170: construction in 4 draws.
- Day 175: 8 of 8 units complete, TCO on 6.
- Day 178: EAT transfers title.
- Day 180: exchange closes. Exchange value $2,050,000. Unused $50,000 is cash boot.
Fees: QI and EAT $22,000, legal $4,000, title $9,000. Boot tax on $50,000: roughly $12,000.
Net: $325,000 deferred, $47,000 in fees and boot tax, $278,000 net benefit. Owns 8 new rental units in a higher-rent submarket. PM spins them up on lease the week post-TCO.
Worked because the builder was pre-approved, plans were permitted for a sister project, and the investor started the build-to-suit conversation with his QI 30 days before closing the Chattanooga sale. Miss any one piece and the 180-day deadline kills the deal.
Build-to-suit is a specialist tool. It solves problems a standard 1031 cannot, but it rewards investors who plan the construction timeline before starting the tax clock. Do not sell Property A and then figure out what to build. Line up the build, then sell.
Related 1031 resources
- Complete 1031 guide: doorvault.app/pillar/1031-exchange
- Reverse exchange guide: blog.doorvault.app/reverse-1031-exchange-guide
- 1031 boot and recapture: blog.doorvault.app/1031-exchange-boot-depreciation-recapture
- 1031 glossary: doorvault.app/glossary/1031-exchange
- 45/180 day timer: doorvault.app/tools/1031-exchange-timer
DoorVault helps PM-managed investors verify owner statements, track portfolio performance, and prepare taxes with AI-powered intelligence. On a build-to-suit exchange, DoorVault tracks construction draws, land cost, and basis alongside your portfolio so you know exactly how much exchange value has been deployed at any point before day 180. Start free at doorvault.app.
