The 45-Day Identification Period

Every deferred 1031 exchange runs on the same first deadline: 45 calendar days from the closing of the relinquished property to identify, in writing, the replacement property or properties the exchanger intends to acquire. The clock is not negotiable and does not pause for a holiday, a slow appraisal, or a seller who needs another week to think it over. In a market like Pitkin County, where lodging units, condo interests, and commercial buildings trade infrequently, understanding exactly how the identification rules work matters more than in a deeper market with dozens of comparable listings to choose from at any given time.

The 45-day period begins on the day the relinquished property closes and transfers title, not on the day the exchanger decides to sell or the day a qualified intermediary is engaged. It runs on consecutive calendar days, and there is no extension available for a deadline landing on a weekend or a federal holiday, aside from limited relief the IRS has occasionally granted for federally declared disasters. Once the 45th day passes without a written, signed identification delivered to the qualified intermediary, the exchange fails unless a replacement property was already acquired within that same window.

Nothing prevents an exchanger from touring, negotiating, or even placing a replacement property under a contingent contract before the relinquished sale closes. That early work does not shorten the 45 days, and it can be the difference between an identification list built calmly and one assembled under pressure in the final week.

Most exchanges use the three-property rule, which permits identifying up to three replacement properties of any value, with no cap on the total purchase price. An exchanger does not have to buy all three; identifying more candidates than needed simply builds redundancy in case financing, inspection, or title issues eliminate the top choice. This is the rule most Aspen-area exchangers rely on when trading into a single replacement asset, since three well-chosen candidates usually cover a reasonable range of outcomes even in a market with limited inventory.

An exchanger who wants to identify more than three properties can do so under the 200% rule, as long as the combined fair market value of every identified property does not exceed 200% of the value of the relinquished property. This rule tends to come up when an investor is diversifying sale proceeds across several smaller assets instead of concentrating into one larger replacement, or when a mountain-market exchanger wants a longer candidate list to offset a thin pool of qualifying inventory in Pitkin County or the surrounding valley towns.

The 95% rule is the exception that allows identifying more properties than the 200% rule would otherwise permit, on the condition that the exchanger actually acquires at least 95% of the aggregate value of everything identified. In practice this rule is used sparingly, because failing to close on that 95% threshold disqualifies the entire identification list, not just the properties that were not purchased. It generally only makes sense when an exchanger has a high degree of confidence that nearly every identified property will close.

A valid identification has to be a written document, signed by the exchanger, and delivered to a party to the exchange, most commonly the qualified intermediary, before midnight on day 45. Verbal mentions, an email that never reaches the intermediary, or a text message to a broker do not satisfy the requirement.

• Unambiguous legal description or condo unit designation for each property, since a street address alone can be inadequate for units sharing one building address
• Signature of the taxpayer or an authorized representative
• Delivery to the qualified intermediary or another qualifying party, not simply discussed with a seller or agent
• A dated receipt or delivery confirmation kept with the exchange file

An identification can be revoked or revised any time before day 45 closes, as long as the change is also in writing and delivered before the deadline. Investors weighing a dedicated 45-day identification strategy for a compressed Aspen-area search often start with this exact checklist before narrowing the candidate list.