Investor's Guide to 1031 Exchanges
If you’re selling a multifamily property in San Diego, a 1031 exchange may let you defer the capital gains tax you’d otherwise owe, sometimes tens or hundreds of thousands of dollars, by rolling the proceeds into another investment property. Most investors have heard the term. Far fewer understand the exact deadlines, what actually qualifies as “like-kind,” or how a single missed detail can disqualify the entire exchange.
This guide breaks it down in plain language. What a 1031 exchange does. Who qualifies. The two deadlines that make or break it. And where San Diego investors most often get tripped up.
Note: This page is for general informational purposes only and is not tax or legal advice. 1031 exchange rules are strict and unforgiving of small mistakes. Consult a qualified intermediary, CPA, or real estate attorney before initiating an exchange.
Managed
Managed
What Is a 1031 Exchange?
A 1031 exchange, named for Section 1031 of the Internal Revenue Code, allows an investor to sell a business or investment property and reinvest the proceeds into a new "like-kind" property while deferring the capital gains tax that would normally be due on the sale. The tax isn't eliminated, it's deferred, rolled forward into the replacement property's cost basis until that property is eventually sold without another exchange.
For multifamily owners in a market like San Diego, where appreciation has been strong for years, this matters enormously. A sale without an exchange can trigger a capital gains bill large enough to change what an investor can afford to buy next. A properly executed exchange keeps that entire amount working as investment capital instead.
Capital Gains Deferral
Defers federal and California capital gains tax on the sale of investment real estate, as long as proceeds go into a qualifying replacement property.
Portfolio Repositioning
Lets investors move from one property type or location to another (a duplex into a multifamily building, for example) without a tax event forcing the decision.
Does Your Property Qualify?
Not every sale qualifies, and not every replacement purchase does either. The property must be held for investment or business use, and the replacement property must be "like-kind," a much broader category than most investors expect.
PROPERTY TYPES THAT TYPICALLY QUALIFY
- Multifamily apartment buildings held for rental income
- Single-family rentals held as investment property (not a primary residence)
- Commercial property such as retail, office, or industrial buildings held for investment
- Vacant land held for investment purposes
- A fractional or tenancy-in-common interest in investment real estate
PROPERTY TYPES THAT TYPICALLY DO NOT QUALIFY
- A primary residence
- A second home used personally more than incidentally
- Property held primarily for resale, such as a house flip
- Personal property (eliminated from 1031 treatment in 2018; only real property now qualifies)
- Property located outside the United States
Critical point on "like-kind." "Like-kind" refers to the nature of the investment, not the type of property. A San Diego fourplex can be exchanged for a commercial strip mall, raw land, or an out-of-state apartment complex, all qualify, as long as both properties are held for investment or business use within the United States. Investors frequently assume they must buy the "same kind" of property they sold. They don't.
The Two Deadlines That Make or Break an Exchange
A 1031 exchange lives or dies on two dates, both counted from the closing date of the property you sold. There are no extensions for personal circumstances, no exceptions for a deal falling through at the last minute, and no do-overs.
Close of sale on the relinquished (sold) property. The clock starts immediately.
Deadline to formally identify replacement property in writing to your qualified intermediary.
Deadline to close on the purchase of the replacement property.
The 45-day identification rule
From the day the sale closes, you have exactly 45 calendar days, not business days, to identify potential replacement properties in writing. Most investors use one of two identification rules:
- The Three-Property Rule: Identify up to three properties of any value.
- The 200% Rule: Identify more than three properties, as long as their combined value doesn't exceed 200% of what you sold.
The 180-day exchange period
You then have until day 180 (not an additional 180 days after identification, the full 180 runs from the original closing) to close on the purchase of the replacement property. If your tax filing deadline falls before day 180, you may need to file for an extension to preserve the full exchange window.
A practical example. An investor sells a San Diego fourplex on March 1 for $1,200,000, with $400,000 in capital gains.
By April 15 (45 days later), they must identify replacement property in writing. By August 28 (180 days from the March 1 closing), they must close on the replacement purchase. The replacement property must be of equal or greater value than the property sold, and all net proceeds must be reinvested, to defer 100% of the gain.
Why You Need a Qualified Intermediary
You cannot touch the sale proceeds at any point in the exchange. The moment funds pass through your hands, or even into an account you control, the exchange is disqualified and the full gain becomes taxable in that year. This is where a Qualified Intermediary (QI) comes in.
A QI is an independent third party who holds the sale proceeds in escrow between the two transactions and prepares the exchange documentation required by the IRS. The QI must be lined up before the sale of the relinquished property closes. Bringing one in after closing is too late, the exchange cannot be constructed retroactively.
Who cannot serve as your Qualified Intermediary. The IRS disqualifies anyone who has acted as your employee, attorney, accountant, investment banker, broker, or real estate agent within the two years before the exchange. This is why the QI is typically a dedicated exchange company, not someone already on your team.
What Happens When Investors Get It Wrong
Unlike AB 1482, there's no separate enforcement body watching for 1031 mistakes, the exposure shows up directly on your tax return, usually at the worst possible time: after the deadlines have already passed and there's no way to fix it.
The most common ways San Diego investors lose the exchange:
- Missing the 45-day identification deadline by even one day (no exceptions, no extensions)
- Taking any cash "boot" out of the transaction, which is taxed even if the rest of the exchange is valid
- Buying a replacement property of lesser value than the one sold, triggering tax on the difference
- Lining up a Qualified Intermediary after the sale has already closed
- Using sale proceeds for any purpose, even briefly, before the QI takes control of them
- Misjudging what qualifies as "like-kind" and identifying a property type that doesn't meet the standard
A disqualified exchange doesn't just mean paying the tax you tried to defer. It often means paying it in a year you didn't plan for, on a sale that already closed months earlier, with no remaining ability to restructure the deal.
1031 Exchange Checklist for San Diego Multifamily Sellers
Use this as a starting point before listing a multifamily property you intend to exchange. It does not replace guidance from a CPA or qualified intermediary.
Confirm the property has been held for investment or business use, not as a primary or secondary residence.
Line up a Qualified Intermediary before accepting an offer on the property you're selling.
Confirm the QI has no disqualifying relationship with you (employee, agent, accountant, or attorney within the past two years).
Calculate the minimum purchase price and reinvestment amount needed to defer 100% of the gain.
Begin evaluating replacement properties before closing, so the 45-day clock isn't a scramble.
Identify replacement property in writing to the QI within 45 calendar days of closing.
Close on the replacement property within 180 calendar days of the original closing.
Confirm your tax filing deadline doesn't fall before day 180, and file for an extension if it does.
Keep all identification and closing documentation in case of an IRS inquiry.
Frequently Asked Questions
Can I do a 1031 exchange on a San Diego multifamily property?
Yes. Multifamily buildings held for rental income are among the most common property types exchanged under Section 1031, and San Diego’s strong appreciation over the past decade makes deferral especially valuable for local owners selling now.
Do I have to buy the same type of property I sold?
No. “Like-kind” refers to the investment nature of the property, not its physical type. A San Diego apartment building can be exchanged for commercial property, raw land, or an out-of-state multifamily property, as long as both are held for investment or business use.
What happens if I miss the 45-day deadline?
The exchange is disqualified in full. There are no extensions for missing the identification deadline, regardless of the circumstances, and the entire gain becomes taxable in the year the original property was sold.
Can I take some cash out of the sale and still defer part of the gain?
Partially. Any cash or debt relief you receive that isn’t reinvested is called “boot” and is taxable, even if the rest of the exchange is structured correctly. To defer the full gain, all net proceeds must go into the replacement property, and the replacement must be of equal or greater value.
Who can act as my Qualified Intermediary?
Any independent third party without a disqualifying relationship to you, but in practice this is almost always a dedicated 1031 exchange company. The IRS specifically disqualifies your current or recent employee, attorney, accountant, investment banker, broker, or real estate agent.
How long do I have to hold the replacement property?
The IRS doesn’t specify an exact minimum holding period, but most tax professionals recommend holding a replacement property for at least one to two years to support the position that it was acquired for investment, not resale.
Selling or Exchanging a San Diego Multifamily Property Is Part of What We Do.
Mendes Company advises San Diego multifamily owners through the full lifecycle of a sale, from pricing and marketing the property to coordinating timelines with your Qualified Intermediary so your exchange deadlines are never at risk. If you’re considering a sale and want a brokerage partner who understands both the market and the mechanics of a 1031 exchange, let’s talk.