Updated August 17, 2026
An improvement exchange — also called a build-to-suit or construction exchange — lets you use exchange proceeds not just to buy a replacement property but to improve it, with the cost of those improvements counting toward the value you must reinvest. It solves a specific and common problem: you have $4 million of proceeds and the building you want costs $3 million, leaving $1 million of taxable boot. Spend that million on the property as part of the exchange and the problem disappears.
It is also the most operationally demanding version of a 1031, and the constraint that defeats most attempts is not money. It is the calendar.
You cannot simply buy a property and then renovate it with exchange funds afterwards. Once you take title, the exchange is complete and further spending is your own money.
So the property is held by an exchange accommodation titleholder — an entity affiliated with your qualified intermediary — which takes title, receives the exchange funds, and pays for the improvements as the work proceeds. When the work is done, or when the deadline arrives, title transfers to you and the exchange closes.
Crucially: only improvements actually completed and paid for by day 180 count toward the exchange value. Work in progress does not. A half-built addition on day 180 counts for what has been installed, not for what it will eventually be worth.
This is the whole difficulty.
You have 180 days from the closing of your relinquished property to complete the acquisition and the improvements. In Los Angeles, that is a genuinely tight window for anything requiring permits.
Which shapes what actually works:
Works well: unit renovations and turns, roofing, plumbing and electrical upgrades, seismic retrofit work already engineered and permitted, HVAC, landscaping, common-area work — scopes that can be scheduled, bid and completed inside a few months.
Works badly: ground-up construction, anything needing discretionary approvals, additions requiring plan check from scratch, and ADU construction started from zero. LA permitting timelines alone can consume the window.
The determining question is not "can this be built?" but "can this be built, inspected and paid for within 180 days of a closing that has already happened?"
More than a standard exchange, and the fees are the smaller part.
You have a boot problem you cannot otherwise solve. The clearest case. If the replacement you want leaves several hundred thousand dollars unreinvested, the tax on that boot may exceed the cost and hassle of the improvement structure — particularly since boot on a long-held LA building is often taxed at the depreciation recapture rate rather than the capital gain rate.
The replacement needs the work anyway. If you were going to spend the money on the building regardless, doing it inside the exchange spends pre-tax dollars instead of post-tax ones.
The scope is defined and bid. A fixed-price contract with a defined scope and permits already in hand turns a risky structure into a manageable one.
The building is deliverable vacant or partly so. Renovation work in occupied units is slower, more disruptive and — in a rent-controlled jurisdiction — carries tenant-protection exposure that a 180-day schedule does not accommodate well.
A Delaware Statutory Trust interest can absorb a remainder that would otherwise be boot, at a fraction of the complexity. For many sellers this is the better answer to the same problem.
Buying a slightly more expensive property. Obvious, and frequently overlooked while chasing a specific building.
Accepting the boot deliberately. Sometimes paying tax on $200,000 is simply cheaper than an improvement structure. Model it rather than assuming.
Decide before you list. Everything here has to be arranged before the relinquished property closes — QI, accommodation titleholder, lender, contractor, scope.
Have permits and a fixed-price bid in hand before day 0, not day 20.
Confirm your lender will fund a parked property, in writing.
Build a schedule that finishes by day 150, not day 180. Construction slips; the deadline does not.
Get the CPA and a real estate attorney involved at the start. This structure has more moving parts than any other version of a 1031, and the failure modes are expensive.
Can I use exchange funds to renovate a property I already own?
No. Improvements must be made to the replacement property while it is held by the accommodation titleholder, before title passes to you. Work on property you already own is not part of an exchange.
What if the improvements are not finished by day 180?
Only what has been completed and paid for counts toward the exchange value. Anything short of your reinvestment target becomes boot and is taxable. This is why the schedule should target day 150.
Does the work have to be permitted?
Improvements should be lawful and properly permitted — an unpermitted addition creates a valuation and disclosure problem for the property regardless of the exchange, and can affect what an appraiser and a lender will recognize.
Is this the same as a reverse exchange?
Related but distinct. A reverse exchange parks a property you buy before selling. An improvement exchange parks a property so it can be improved with exchange funds. They can be combined, which is the most complex version of all and needs specialist counsel.
Is it worth it for a small amount of boot?
Usually not. For $50,000 of boot the structure costs more than the tax. For several hundred thousand on a low-basis LA building, run the numbers — the recapture rate makes boot more expensive than sellers expect.
An improvement exchange is a real solution to a real problem, and the problem is almost always the same one: a replacement property that does not absorb all the proceeds. Before reaching for it, price the two simpler answers — a DST interest for the remainder, or simply paying the tax on the boot. If the improvement route still wins, treat the 180 days as 150, get the permits and the fixed-price bid before you close, and confirm your lender in writing.
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