The 1031 exchange, in Los Angeles.

If you've owned an investment property in Los Angeles for any meaningful length of time, you're probably sitting on a meaningful gain. A duplex bought in West Adams in 2015 for $650,000 might be worth $1.4M today; a small Mid-City apartment building purchased a decade ago has likely doubled. Sell it without planning, and federal capital gains, depreciation recapture, California state income tax, and (above certain thresholds) Measure ULA can take a third or more of the proceeds off the table. The single most useful tax provision in real estate — Section 1031 of the Internal Revenue Code — is what lets you defer most of that, indefinitely, by rolling the gain into the next property.

This primer is the working version for LA investors. It covers what a 1031 exchange actually is, the two deadlines that run everything, the California-specific wrinkles, how it interacts with Measure ULA, and the common LA scenarios where it pays off. It's not a substitute for a conversation with a CPA and a qualified intermediary; it's the read that lets you have that conversation with context.

What a 1031 exchange actually is.

A 1031 exchange, named after Section 1031 of the Internal Revenue Code, lets a real estate investor sell an investment or business-use property and reinvest the entire proceeds into another like-kind investment property — deferring federal capital gains tax, depreciation recapture, and (in California) state income tax on the gain. The investor doesn't avoid the tax forever; the gain is deferred, not eliminated — but it can be deferred again and again by rolling each subsequent sale into another exchange. Held until death, heirs receive a stepped-up basis and the deferred gain effectively disappears.

Three structural requirements define the exchange. Like-kind: both properties must be real property held for investment or business use — the standard is broader than most people think. Same taxpayer rule: the legal entity that sold the relinquished property must be the same entity that acquires the replacement. Qualified intermediary: the proceeds cannot touch the investor's hands; a third party holds them between transactions.

The two deadlines that run everything.

Once you close on the relinquished property, two clocks start running — and both are absolute. No extensions for weekends, holidays, escrow delays, lender issues, or natural disasters. Missing either deadline by a single day collapses the exchange and triggers full tax on the gain.

The 45-day identification rule. Within 45 calendar days of closing the sale, you must identify potential replacement properties in writing — usually to your qualified intermediary. The standard mechanism is the Three-Property Rule: up to three candidates of any value. Most LA investors use it. For a buyer working a 45-day clock, off-market inventory access materially expands what's identifiable in time.

The 180-day completion rule. You must close on the replacement within 180 days of the relinquished sale — OR by the tax filing deadline for the year of the sale, whichever comes first. This is the Q4 trap: sell after October 16 and the default deadline becomes April 15. Filing a tax extension restores the full 180-day window. A planning conversation with your CPA before the relinquished sale closes prevents this.

The qualified intermediary — before the sale.

The qualified intermediary is the third party who holds your sale proceeds between transactions. They exist for one purpose: to keep you from having constructive receipt of the funds, because the moment you do, the exchange dies. Two practical points. First, the QI must be engaged before the relinquished property closes — you cannot retroactively designate one. Second, the QI has custody of your money for the entire window, so use an established firm with insurance, segregated client accounts, and a clean track record.

Constructive receipt of the proceeds — even briefly — invalidates the exchange and makes the full gain immediately taxable.

California's clawback rule.

California follows the federal 1031 framework but adds state-specific layers. The clawback: when you exchange a California property for an out-of-state replacement, the Franchise Tax Board keeps tracking the deferred gain. When you eventually sell that out-of-state property without another exchange, California taxes the original deferred gain at California rates — even if you've moved out of state. To enforce tracking, the FTB requires you to file Form 3840 annually while you hold the replacement. There's also mandatory Form 593 withholding (3.33% of sale price) at closing, with an exception you claim for a valid exchange — and no California carve-outs from the federal 45/180 timelines.

Measure ULA — a 1031 does not defer it.

This is the most common misconception we hear at the top of the market. A 1031 defers federal capital gains and California state income tax. It does not defer or avoid local transfer taxes — including Measure ULA. Sell a relinquished property in the City of Los Angeles above roughly $5.32M and ULA's 4% transfer tax is owed at closing, before proceeds even reach the QI. Above $10.64M, the rate is 5.5%. On a $10M LA apartment building, ULA alone is $400,000+. Structuring an exchange that stays under the ULA thresholds — selling multiple smaller properties instead of one large one — can meaningfully lower the total tax cost.

Common LA investor scenarios.

The trade-up. A West Adams or Culver City duplex bought in the 2010s for $600K–$900K has appreciated to $1.4M–$2.2M, and the owner wants a larger asset — a fourplex, small apartment building, or two rentals in a higher-growth submarket. The duplex trade-up play lets the entire equity roll forward without tax. Geographic diversification. Sell a fully-appreciated LA rental and exchange into a higher-yield out-of-state market — accepting California's clawback as the cost. Type change. A management-heavy single-family rental gets exchanged into a passive triple-net lease or DST interest. Before any of these, run the numbers so the replacement actually pencils.

When not to do a 1031.

Late-life estate planning: if the goal is to pass property to heirs, holding to death lets the stepped-up basis eliminate the deferred gain entirely — a 1031 in your 80s adds complexity without much benefit. Cash-out events: a 1031 is an exchange, not a cash extraction. Pulling cash from the sale is "boot" and is immediately taxable. The general rule: 1031 if you want to stay in real estate with the same after-tax basis; pay the tax if you want to leave real estate or restructure significantly. On the LA side, an agent who knows the off-market inventory in your target submarkets can dramatically expand what's identifiable inside the 45-day clock — often the difference between a clean exchange and a panicked one.

Section 1031 rules cited reflect federal and California state law as of May 2026. ULA thresholds are adjusted annually. This article is informational and educational only, is not tax, legal, or financial advice, and is not a substitute for advice from a qualified CPA or tax attorney. Always consult your tax advisor and qualified intermediary before initiating a 1031 exchange.