The short answer
List one or more Delaware Statutory Trusts on your 45-day identification notice next to the property you actually want: if the primary deal dies after day 45, the DST is already identified, already owns and finances its real estate, and can close on a subscription within days of the QI receiving the paperwork. Identify each DST by name and the percentage interest you would buy, keep the list inside the three-property or 200% limits, and clear the sponsor's accredited-investor paperwork in advance so the backup is executable rather than theoretical.
At a glance
| Legal basis | Rev. Rul. 2004-86: a DST interest is exchanged as an interest in the real estate |
|---|---|
| How to list it | Trust name plus the specific percentage interest you would acquire |
| Room on the list | 3 properties of any value, or any number totalling up to 200% of the sale price |
| After day 45 | No names can be added; only identified DSTs can rescue the exchange |
| Closing speed | Platforms report 3 to 5 business days once subscription documents are complete |
| Minimums | Commonly $25,000 to $100,000 per DST, so one list can carry several |
Why a DST belongs on the list: the property already exists, is already financed and cannot fail on inspection
A backup only works if it cannot fail for the same reasons the primary can, and a DST removes the three usual killers: the trust already owns the building, the non-recourse loan is already in place, and there is no inspection, appraisal or seller left to walk. Rev. Rul. 2004-86 holds that a taxpayer may exchange real property for an interest in a properly structured DST without recognizing gain, which is what makes the interest identifiable like any other real estate.
The traditional DST page describes what you would own and the DST library covers sponsors, fees and risks; this page is only about using one as insurance. The identification deadline is the whole strategy: 1031 Crowdfunding and Legal 1031 both describe DSTs as fall-back options on the identification statement, and a DST that is not on the list by midnight of day 45 cannot rescue anything.
How to write a DST on the identification notice so it counts
Reg. §1.1031(k)-1(c) requires a written identification, signed by you and delivered to the QI or another party to the exchange by the end of day 45, describing real property by legal description, street address or distinguishable name. For a fractional interest, Legal 1031's guidance is to identify the specific percentage that will be acquired, so the entry reads as the trust's name, the property it holds and the percentage interest, for example a 1.2% beneficial interest in a named trust holding a named building.
Count the DST against the same limits as any other property: three of any value, or any number whose total value at the end of the identification period is no more than 200% of what you sold; exceed both and only property actually received worth 95% of everything identified counts. The value of a DST entry is the value of the interest you name, which is why the percentage should be sized to the proceeds you might need to place.
Hypothetical list for a $1,000,000 sale under the three-property rule: (1) the office condo you want at $950,000; (2) a 2.0% interest in DST Alpha, roughly $600,000 of property value; (3) a 1.5% interest in DST Beta, roughly $500,000. You can revoke and re-sign the list any time before midnight of day 45, and the identification answer covers delivery to the QI.
Between day 46 and day 180: what happens when the primary deal dies
Nothing can be added after day 45, so the question becomes how much of the proceeds the identified DSTs can absorb and how fast. Every dollar not reinvested by day 180 is boot taxed under §1031(b), and mortgage you paid off but did not replace is boot too; a DST's allocated non-recourse debt, described by 1031 Crowdfunding as pre-packaged financing allocated by investment amount, is how the debt side gets covered without personal underwriting.
A typical sequence, with day counts taken from platform-reported timelines rather than any IRS rule:
- Same day: tell your advisor and QI in writing that the primary has failed, and confirm the DSTs on your list still have capacity, because offerings close and an identified DST that is fully subscribed is no backup.
- Day 1 to 2: complete the sponsor's subscription documents and accredited-investor verification, and sign the QI's assignment of the purchase to the trust.
- Day 2 to 4: the QI wires the subscription amount to the sponsor's escrow on the trustee's instructions.
- Day 3 to 5: the sponsor countersigns, the interest is issued, and the closing confirmation goes to the QI's file as receipt of replacement property.
- If proceeds remain after the last identified DST closes, the QI may release them, and that remainder is taxable boot.
Evaluating a DST in days without being reckless
Speed is the point, but the trust you close on is a five-to-ten-year hold with no public market, so the review has to cover the items that cannot be changed later. Reserve equity in two candidates from different sponsors while the primary is still alive; a single sponsor, a single tenant or a single loan maturity is a concentration you chose under time pressure.
- Sponsor track record and the master lease structure; see how to evaluate sponsors and master lease risk.
- Loan terms and maturity, and whether the allocated debt matches the mortgage you need to replace; the leverage guide explains the interest-rate exposure.
- Fees and reserves in the PPM, using the PPM reading guide.
- Asset class fit with the rest of your holdings, from the DST asset class overview.
- The trustee's operating limits, which prohibit new capital, new borrowing and substantial improvements once the offering closes; the key risks overview lists them.
Boot versus full deployment: when a little tax beats forcing every dollar into a trust
The decision is arithmetic. Boot is generally absorbed first by unrecaptured §1250 gain at up to 25% plus 3.8% NIIT (the recapture-first answer covers the ordering), so $60,000 left over costs at most about $17,300 federal, while a second DST subscription at a $100,000 minimum may not even be possible for that amount; paying that tax and keeping the cash can be the better outcome.
Scale it up and the answer flips: $300,000 unplaced could cost about $86,400 at the same rates, which justifies a second subscription in a different trust. The intentional boot guide and the exchange equation guide show the full calculation, and your CPA or attorney should confirm the recapture ordering before you decide.
Our part is the shelf and the wiring: we reserve equity in DSTs from vetted national sponsors while your primary deal is pending, and coordinate the subscription with your QI if it fails, so the backup on your list is one you can actually close.
Related questions
Can I add a DST after day 45 if my primary property falls through?
No. The identification period ends at midnight on day 45 and cannot be extended outside a federally declared disaster, so the DST has to be on the signed list before then.
What if the DST I identified is fully subscribed when I need it?
Then it is no backup, which is why the list should carry two trusts from different sponsors and why equity should be reserved while the primary is still alive; if every identified property fails, the remaining proceeds are taxable.
Can a DST replace the mortgage my buyer paid off?
Yes, through the non-recourse loan already on the trust, which is allocated to each investor in proportion to their interest; for a very high loan balance a zero-cash-flow DST is built for exactly that.
How fast can a DST really close?
Platform-reported timelines are three to five business days from complete subscription documents, and the QI wire is usually the slowest step; do not wait until day 175 to start.
Sources
Checked against these publications on September 19, 2026. Rules and figures change; confirm the current version with your CPA or attorney before you act. This page is general information, not tax or legal advice.
- Rev. Rul. 2004-86, Delaware statutory trust interests as like-kind real property
- 26 CFR §1.1031(k)-1(c), identification rules (Cornell LII)
- 26 U.S.C. §1031(b), boot (Cornell LII)
- 26 U.S.C. §1(h), 25% unrecaptured §1250 rate (Cornell LII)
- IRS Publication 544, identifying alternative and multiple properties
- Legal 1031: How to identify replacement property
- Legal 1031: What is a Delaware Statutory Trust
- 1031 Crowdfunding: Delaware statutory trust pros and cons
- 1031 Crowdfunding: DST 1031 exchange
- Realized: What happens if your replacement property falls through
