Realized 1031 Blog Articles

What Is a Build-to-Suit 1031 Exchange?

Written by The Realized Team | Sep 22, 2026

A Build-to-Suit 1031 Exchange, also known as an improvement or construction exchange, allows investors to defer capital gains taxes by using the sale proceeds of a relinquished property to purchase and enhance a replacement property. This type of exchange ensures that upgrades are made to meet or exceed the value requirements of the IRS within a 180-day period.

Understanding the Build-to-Suit Exchange

The Build-to-Suit 1031 Exchange provides an opportunity for investors to tailor a replacement property to meet specific business or investment needs. Unlike standard like-kind exchanges, it enables the proceeds from a property sale to be reinvested not only in a new property but also in approved improvements or construction on it. This exchange does involve a more complex process requiring strict compliance with IRS guidelines to ensure eligibility for tax deferral on capital gains.

The Process

Selling the Relinquished Property: The first step involves selling your current property.

Involving a Qualified Intermediary (QI): A QI holds the sale proceeds, maintaining compliance with IRS rules.

Use of an Exchange Accommodation Titleholder (EAT): An EAT temporarily takes title to the replacement property to facilitate improvements.

Making Improvements: Within the 180-day timeframe, improvements must be identified within the initial 45-day period and completed to qualify for deferral.

Finalization: Once improvements are finished or the timeframe lapses, the upgraded property is transferred to you.

Key Considerations

Timing and Deadlines: Adhering to the 180-day and 45-day deadlines is crucial.

Valuation: The combined value of the replacement property and improvements must at least equal the relinquished property's value to avoid taxation.

Regulatory Compliance: IRS rules must be meticulously followed throughout the transaction to secure tax benefits.

Potential Benefits

Tax Deferral: As with traditional 1031 exchanges, investors can defer capital gains taxes.

Enhanced Property Value: Improvements can significantly boost the market value of the replacement property.

Flexibility: The strategy allows for property customization, catering to specific investment goals.

Frequently Asked Questions

Can a Build-to-Suit 1031 Exchange be used to add an ADU?

Yes, adding an Accessory Dwelling Unit (ADU) using funds from a Build-to-Suit Exchange is possible. However, such improvements must be made to the replacement property and must adhere to IRS procedures to qualify for tax deferral.

What happens if improvements aren't completed within 180 days?

If the enhancements are not finalized within the 180-day period, the exchange portion associated with those incomplete enhancements may become taxable, thereby reducing the overall tax deferral benefit.

How does the role of an Exchange Accommodation Titleholder (EAT) impact this process?

An EAT is essential for holding temporary title to the replacement property and facilitating necessary improvements. This entity ensures that enhancements comply with IRS rules, preserving the exchange's tax-deferral structure.