Here is the structural awkwardness at the center of every exchange, and almost nobody names it out loud.
By day 45 you must commit, in writing, to the properties you may buy. You are not required to have them under contract. You are not required to have inspected them. You are simply required to name them, and after that your list is locked.
Then you spend the next 135 days finding out what you actually committed to.
Identification is a promise made on incomplete information. That is not a flaw you can engineer away, but it is a risk you can manage, and the owners who manage it well all do the same thing: they move diligence earlier than feels necessary.
Why the sequence is genuinely uncomfortable
Nothing in the rules requires diligence before identification. That sounds like flexibility and behaves like a trap.
Suppose you identify three properties, put your effort into the one you want, and discover on day 60 that the roof is failing, the survey shows an encroachment, or a Phase I turns up a recognized environmental condition. You can walk away from that purchase. What you cannot do is add a new property to your list. Your remaining options are whatever else you named on day 45, however casually you named it, as we covered in the identification rules.
The 180-day clock is running the whole time, and it does not care that you are re-trading a purchase price or waiting on a lender who now wants a second appraisal.
Front-load, and prioritize what kills deals
The practical response is to compress the ordinary diligence calendar into the first half of the identification window, so that a defect surfaces while you still have room to move.
- Days 1 to 15: the cheap, fast, deal-killing checks. Title and survey review, a look at the rent roll and leases, obvious physical concerns, and the zoning and use questions that would end the conversation immediately. These are inexpensive relative to the exchange and they eliminate bad candidates early.
- Days 15 to 35: the slower, costlier work. Property condition assessment and, where there is any environmental exposure, a Phase I Environmental Site Assessment. The current standard is ASTM E1527-21, which is the EPA-recognized "all appropriate inquiry" approach. A Phase I is non-invasive, involving no sampling, and it identifies recognized environmental conditions while helping preserve certain liability protections. On anything industrial, automotive, agricultural, or with a long or unclear operating history, this is not optional in our view.
- Days 35 to 45: decide what actually goes on the list. By now you know which candidates survived. Identify with information rather than optimism, and make the backups real.
| Timing | Work | Why here |
|---|---|---|
| Days 1-15 | Title, survey, leases, zoning, obvious physical issues | Cheap and fast; kills bad deals early |
| Days 15-35 | Property condition assessment, Phase I if warranted | Slower and costlier; needs runway |
| Days 35-45 | Finalize the identification list | Decide with real information |
| Days 45-180 | Complete remaining diligence, finance, close | The list is locked; no new candidates |
The backups are the actual insurance
Everything above still leaves the possibility that your first choice fails. The defense is not perfect diligence, it is a list you would genuinely be willing to buy from.
That means naming backups you have actually looked at, not placeholders added at the last minute to fill three slots. It is also why a DST interest so often appears as the third identification: it can close in days, it comes in flexible dollar amounts, and it converts a collapsed primary deal from a disaster into an inconvenience. DSTs are offered to accredited investors through private placement and carry real risks, including illiquidity, fees, and loss of principal, so they belong on the list as a considered fallback rather than a reflex.
One judgment call worth making consciously
There is a real tension here. Spending heavily on diligence for three properties when you will buy one is expensive, and some owners reasonably choose to do full work only on the primary and lighter work on the backups.
That is a defensible position, provided it is a decision rather than an accident. What is not defensible is naming two properties you have never seriously evaluated and hoping the first one holds. The cost of a Phase I is trivial against the cost of a failed exchange, or against owning a property with a problem you did not price. Which diligence to run, and how far, is exactly the conversation we have while the clock is still young, as part of our exchange process.
Questions we field about due diligence and the 45-day window
Do I need a property under contract to identify it?
No. Identification requires only an unambiguous written description delivered to your qualified intermediary by day 45. No contract, deposit, or completed inspection is required.
What happens if diligence kills my deal after day 45?
You can walk away from that purchase, but you cannot add a new property to your list. You are limited to the other properties you already identified, which is why credible backups matter.
What is a Phase I environmental site assessment?
A non-invasive review of a property's environmental history and condition, performed to the ASTM E1527-21 standard. It identifies recognized environmental conditions and helps preserve certain liability protections without sampling.
When should I order a Phase I?
Early, ideally within the first half of the identification window, so a finding still leaves you time to pivot. It is particularly important for industrial, automotive, agricultural, or long-operated sites.
Should I run full diligence on backup properties?
That is a cost judgment. Many owners do lighter work on backups, which is reasonable if deliberate. What is not reasonable is identifying properties you have never meaningfully evaluated.