By Jacob Lavian, Los Angeles Real Estate Advisor
If you own a home in Los Angeles and you’ve started thinking seriously about buying an investment property — a small apartment building, a duplex, a fourplex — you’ve probably run into two terms that seem straightforward until you try to use them: cap rate and cash-on-cash return.
Most articles explain what they are. Fewer explain how they actually get used in real LA transactions, why the two numbers can tell completely different stories about the same property, and which one actually matters when you’re sitting across the table from a seller.
This is that article.
By the end, you’ll understand not just the formulas, but the judgment behind them — and why experienced Los Angeles multifamily investors use both numbers together, never in isolation.
Why This Matters More in Los Angeles Than Almost Anywhere Else
Before we get into the math, it’s worth acknowledging something that any honest conversation about LA real estate has to address: the numbers here don’t look like the rest of the country.
Cap rates in Los Angeles are compressed. Depending on the submarket, you might be looking at 4% to 5.5% cap rates on small apartment buildings in desirable areas — sometimes lower. In markets like Dallas, Phoenix, or Atlanta, investors routinely find 6%, 7%, even 8% cap rates on comparable properties.
So why do people keep buying apartment buildings in Los Angeles?
Because cap rate is only one part of the picture. And in a market defined by long-term appreciation, rent growth, and structural housing undersupply, the investors who focus exclusively on cap rate often miss deals that create generational wealth — while the investors who ignore it entirely end up buying properties that can’t service their debt.
Understanding both metrics, and knowing when each one applies, is the foundation of smart multifamily investment strategy in Los Angeles.
Cap Rate: What It Is and What It’s Actually For
The formula:
Cap Rate = Net Operating Income (NOI) ÷ Purchase Price
Net Operating Income is your gross rental income minus all operating expenses — property taxes, insurance, maintenance, management fees, landscaping, utilities you cover, and a vacancy allowance. It does not include mortgage payments. Cap rate is a financing-agnostic metric.
A simple example:
You’re looking at an 8-unit building in the San Fernando Valley listed at $2,000,000. The gross annual rents are $192,000. After operating expenses of $72,000, the NOI is $120,000.
$120,000 ÷ $2,000,000 = 6.0% cap rate
That’s a reasonable starting point for that submarket. But here’s what most first-time buyers miss — cap rate tells you how the property performs as an asset, completely independent of how you’re financing it. It’s a valuation tool, not a cash flow tool.
What Cap Rate Is Good For:
Comparing properties apples-to-apples. If you’re looking at a 6-unit in Koreatown and an 8-unit in Reseda, cap rate lets you compare them on the same basis regardless of their size or price point.
Understanding market pricing. When you know that 5-unit to 10-unit buildings in a given LA submarket are trading at 4.5% to 5.5% cap rates, you can immediately tell whether a listing is priced at market, above market, or — rarely — below it.
Identifying value-add opportunity. If a property has below-market rents (common in RSO buildings with long-term tenants), the current cap rate reflects today’s income. The pro forma cap rate — calculated using market rents — shows you the upside. The gap between those two numbers is often where the real investment thesis lives.
What Cap Rate Does NOT Tell You:
Cap rate tells you nothing about your actual cash experience as an investor. It doesn’t account for your down payment, your mortgage rate, your loan terms, or how much money you’re actually putting in your pocket each month. That’s where cash-on-cash return comes in.
Cash-on-Cash Return: The Number That Tells You What You’re Actually Earning
The formula:
Cash-on-Cash Return = Annual Pre-Tax Cash Flow ÷ Total Cash Invested
Annual pre-tax cash flow is what’s left after you’ve paid all operating expenses and your mortgage. It’s what hits your bank account.
Total cash invested includes your down payment, closing costs, any immediate repairs or improvements, and reserves you fund at closing.
Using the same example:
Same 8-unit building. NOI of $120,000. You put 30% down ($600,000), close with $25,000 in costs, and fund $15,000 in immediate repairs. Total cash in: $640,000.
You finance $1,400,000 at 7.25% over 30 years. Annual debt service is approximately $114,600.
$120,000 NOI − $114,600 debt service = $5,400 annual cash flow $5,400 ÷ $640,000 = 0.84% cash-on-cash return
That number might surprise you. At a 6% cap rate, many first-time buyers assume they’re going to be cash-flow positive in a meaningful way. But with today’s interest rates and LA’s compressed cap rates, the math is often tight — sometimes very tight.
Does that mean the deal is bad? Not necessarily. But it means you need to understand why you’re buying it.
The Honest Conversation: Why LA Investors Still Buy at These Numbers
Here’s where residential homeowners transitioning into investment property often get tripped up. They apply a single-family homeowner’s logic — “this needs to cash flow well from day one” — to a multifamily asset class that often operates on a different value proposition in this market.
Experienced LA apartment building investors are frequently buying for a combination of:
1. Rent growth. Los Angeles has a structural housing shortage. Rents have historically increased over time, and as leases turn over — especially in RSO buildings where below-market tenants eventually vacate — there is often meaningful rent upside that improves cash flow year over year.
2. Appreciation. Apartment buildings in LA have appreciated significantly over the long term. The wealth creation often comes from the equity position, not the monthly cash flow.
3. Leverage on a hard asset. Even a near-zero cash-on-cash return means a tenant base is essentially paying down your mortgage every month. The principal paydown on a $1.4M loan over 10 years is a form of return that doesn’t show up in either metric.
4. Tax advantages. Depreciation, cost segregation, and 1031 exchange options create tax efficiency that can substantially improve your real, after-tax return — none of which appears in cap rate or cash-on-cash calculations.
None of this means you should overpay for a building with unsustainable fundamentals. It means that a sophisticated investment property analysis in Los Angeles goes beyond two numbers on a spreadsheet.
How to Use Both Metrics Together: A Practical Framework
Here’s how experienced investors actually use cap rate and cash-on-cash in tandem when evaluating a deal:
Step 1: Use Cap Rate to Filter
When you’re scanning listings or comparing opportunities, cap rate is your first filter. In the current LA market, if a well-located 5- to 12-unit building is showing a cap rate meaningfully below 4%, you need a very strong appreciation thesis or significant value-add angle to justify the compressed yield. If it’s at or above market cap rate for the submarket, it warrants a deeper look.
Step 2: Use Cash-on-Cash to Stress Test
Once a deal passes the cap rate filter, model the cash-on-cash under your actual financing terms — not a best-case scenario. Use current rates, your actual down payment, and realistic operating expenses. If the cash-on-cash is negative (meaning the property loses money each month before any appreciation), understand exactly what your carrying cost is and whether your financial position can sustain it while the value-add thesis plays out.
Step 3: Model the Pro Forma
If current rents are below market — which is common in RSO buildings with long-tenured residents — calculate the pro forma NOI using market rents. Model a conservative timeline for achieving those rents through natural turnover. That gives you the projected cap rate and cash-on-cash return at stabilization, which is often the real case for the investment.
Step 4: Build in a Margin of Vacancy and Expense Creep
New investors consistently underestimate operating expenses and vacancy. In Los Angeles, budget at least 5% to 8% vacancy even in a strong rental market, and add a 10% contingency to your maintenance line. Buildings — especially older ones — always cost more to operate than the seller’s rent roll suggests.
A Note on How Sellers Present These Numbers
This is important, and most buyers learn it the hard way.
When a seller or broker presents a cap rate, they are almost always using their income and their expense figures. Those figures may:
- Exclude management fees (if the owner self-manages)
- Use optimistic vacancy rates
- Understate maintenance expenses
- Exclude property tax reassessment post-sale (in California, a sale triggers Prop 13 reassessment, which can significantly increase your property tax basis)
Always recast the financials yourself using your own assumptions before you trust any cap rate or cash-on-cash number in a listing package. This is one of the most valuable things a Los Angeles real estate advisor with multifamily experience does during the due diligence process — rebuilding the seller’s numbers from scratch using market-rate assumptions.
What This Looks Like for a Residential Homeowner Making the Transition
If you currently own a home in Los Angeles — say a single family in Culver City, a condo in Santa Monica, or a house in Encino — you already have a significant asset base. The question for many homeowners isn’t whether they can buy an investment property, it’s whether they understand the transition from equity-based thinking (my house went up in value) to income-based thinking (does this asset generate the return I need on my capital).
The two metrics we’ve covered are the foundation of that shift. But they’re a starting point, not an endpoint.
If you’re at the stage of asking “should I pull equity from my home to buy a small apartment building in LA?” or “what can I actually expect to earn on a fourplex versus leaving my money in the market?” — those are exactly the questions worth working through with someone who understands both the residential and commercial sides of this market.
That’s not a sales pitch. That’s just the honest reality that the math alone won’t tell you whether a deal is right for your situation — your tax position, your timeline, your risk tolerance, and your goals. Those variables matter as much as the cap rate.
Quick Reference: Cap Rate vs. Cash-on-Cash at a Glance
| Cap Rate | Cash-on-Cash Return | |
|---|---|---|
| Includes mortgage? | No | Yes |
| Best used for | Comparing properties, valuation | Measuring actual cash return on your investment |
| Affected by financing? | No | Yes — significantly |
| Typical LA range (small multifamily) | 4%–6% | -1% to 4% depending on leverage |
| Limitation | Ignores how you’re financing the deal | Ignores appreciation and equity paydown |
The Bottom Line
Cap rate and cash-on-cash return are not competing metrics — they answer different questions. Cap rate tells you what a property is worth relative to its income. Cash-on-cash tells you what your money is earning in your specific deal.
In Los Angeles, where cap rates are compressed and appreciation has historically been a major component of total return, leaning on either number exclusively leads to bad decisions. The investors who do well here understand both, model conservatively, and buy with a clear thesis — not just because the numbers pencil.
If you’re a homeowner thinking seriously about buying your first investment property in Los Angeles, the next step isn’t finding a listing. It’s understanding what return profile you need, what you can realistically expect in this market, and how to structure a search that fits your actual goals.
That conversation is worth having before you ever look at a property.
Jacob Lavian is a Los Angeles real estate advisor specializing in residential sales and commercial multifamily acquisitions. With 12+ years in the LA market, Jacob helps homeowners and investors make strategic moves with clarity and confidence. Schedule a consultation or learn more about Jacob’s approach.
Related reading: How Many Units Can You Really Self-Manage? A Los Angeles Apartment Buyer’s Guide
