If you invest in apartment buildings, few numbers matter more at the start of a deal than the cap rate. It is one of the fastest ways to size up a property’s income potential, compare one asset to another, and think about value in relation to risk. But cap rates are also easy to misuse, especially if you treat them like a complete underwriting model instead of what they really are: a snapshot metric. Source
In multifamily real estate, cap rates matter because they connect a property’s net operating income to its market value. They help investors judge pricing, compare similar apartment assets, and understand how market conditions, location, growth expectations, and financing environments can influence value. Freddie Mac notes that elevated and volatile interest rates can put negative pressure on property values, while JPMorgan notes that borrowing costs and larger economic conditions can influence cap rates. Source Source
What Is a Cap Rate in Real Estate?
A capitalization rate, usually called a cap rate, is the ratio of a property’s net operating income (NOI) to its asset value or purchase price. In plain English, it shows the return a property generates based on its income before financing is considered. Both JPMorgan and the National Association of REALTORS® define cap rate this way. Source Source
The cap rate formula
Cap Rate = Net Operating Income ÷ Property Value (or Purchase Price)
So if an apartment property produces $120,000 in annual NOI and sells for $2,000,000, the cap rate is 6%. That does not mean the deal is automatically “good” or “bad.” It means the property’s unleveraged return, based on current income and price, is 6%. Source
What Counts as NOI in Multifamily Real Estate?
Net operating income is the income a property produces after operating expenses are deducted. According to JPMorgan, income can include rent plus other sources such as parking, pet fees, and storage income. Operating expenses can include taxes, insurance, utilities, repairs and maintenance, management fees, payroll, and legal or professional fees. Source
Just as important is what NOI does not include. NOI excludes debt service, income taxes, and major capital expenditures such as a roof replacement or a full renovation. That distinction is critical because cap rate is an unleveraged metric; it tells you how the property performs as an asset, not how your financing structure affects your personal return. Source Source
Why Cap Rates Matter in Multifamily Real Estate
For multifamily investors, cap rates are a fast screening tool. If you are reviewing several apartment deals in the same market, cap rate can help you see whether one property appears overpriced or underpriced relative to similar assets. JPMorgan specifically notes that cap rates are useful for comparing buildings and evaluating whether a deal looks promising. Source
Cap rates also reflect the market’s view of risk, growth, and desirability. JPMorgan points to factors such as location, property condition, asset class, tenant quality, anticipated rent growth, and broader economic conditions as influences on cap rates. In general, assets in high-demand, stable locations tend to trade at lower cap rates, while properties in transitional or riskier areas tend to trade at higher cap rates. Source
They matter for valuation as well. Once you know a property’s NOI and the market cap rate for comparable apartment assets, you can estimate value using the inverse relationship:
Value = NOI ÷ Market Cap Rate
That is why a small change in cap rate can have a large impact on value, especially on larger multifamily properties. JPMorgan explicitly highlights using NOI and local cap rates to estimate property value. Source
How to Calculate Cap Rate for a Multifamily Property
Here is the simplest step-by-step process for calculating cap rate on an apartment building:
1. Add up gross income
Start with annual rent from all units, then add other recurring income such as laundry, parking, storage, pet fees, or utility reimbursements where applicable. JPMorgan lists these kinds of ancillary income sources as part of NOI calculations. Source
2. Subtract operating expenses
Deduct normal operating costs like property taxes, insurance, utilities paid by the owner, repairs, maintenance, payroll, management, and professional fees. Source
3. Calculate NOI
Use the basic formula:
NOI = Total Income – Total Operating Expenses
Remember not to subtract mortgage payments, income taxes, or large capital expenditures here. Source
4. Divide NOI by the purchase price or current value
If the building produces $250,000 in NOI and the acquisition price is $4,500,000, then:
$250,000 ÷ $4,500,000 = 5.56% cap rate
This gives you a quick unleveraged return benchmark you can compare against similar multifamily assets in the same submarket. Source
What Is a Good Cap Rate for Multifamily Real Estate?
There is no universal “good” cap rate for apartment buildings. A cap rate that looks attractive in one city may look weak in another. JPMorgan emphasizes that investors need to analyze like-kind comparables and weigh property type, location, income and expenses, quality, and growth expectations when interpreting cap rates. Source
In practice, lower cap rates often show up in markets where investors expect stronger long-term rent growth, greater stability, and lower perceived risk. Higher cap rates may signal more uncertainty, weaker demand, older assets, more operational issues, or less desirable locations. That does not automatically make higher-cap-rate deals better; it means the market is demanding more return for the risk. Source
Current market context matters too. Freddie Mac’s 2025 multifamily outlook says cap rates have flattened while interest rates remain elevated and volatile, putting pressure on property values. CBRE likewise notes that cap rates are shaped by broader capital markets conditions and that movements in cap rates directly affect pricing. Source Source
What Cap Rates Can Tell You About a Market
Cap rates are not just about one building. They also tell you something about the market around it. When cap rates compress—meaning they move lower—values tend to rise faster relative to NOI. When cap rates expand—meaning they move higher—values typically soften unless income growth is strong enough to offset that shift. CBRE’s analysis focuses on this relationship between cap rates and pricing across commercial property sectors, including multifamily. Source
Freddie Mac’s outlook reinforces that point from a multifamily perspective. It notes that high and volatile interest rates, rising cap rates, lower asset values, and moderating property performance can all slow transaction activity. For investors, that means cap rates are both a deal metric and a market signal. Source
A practical takeaway: never compare cap rates in a vacuum. A 5% cap in one submarket might be expensive, while the same 5% cap in a tighter, supply-constrained neighborhood could be entirely reasonable. Like-kind comparisons are the real key. Source
Cap Rate vs. Cash-on-Cash Return
One of the most common mistakes among newer investors is confusing cap rate with cash-on-cash return. Cap rate ignores financing. Cash-on-cash return includes it. Plante Moran describes cash-on-cash return as the leveraged net cash flow generated by a property divided by the total equity invested, while also noting that cap rate is effectively the unleveraged return at acquisition. Source
That distinction matters in multifamily acquisitions because leverage can materially change your actual return. Two investors can buy the same apartment building at the same cap rate and still end up with very different cash-on-cash returns depending on loan terms, down payment, and debt service. Source Source
Cap Rate vs. IRR
Cap rate is a point-in-time metric. IRR, or internal rate of return, is a multi-period return metric that considers the time value of money. Plante Moran explains that IRR measures return across multiple time periods and is heavily influenced by project timing and residual value at sale. Source
For apartment investors, that means cap rate is best used for initial screening and pricing, while IRR is better for evaluating the full business plan—especially if you are doing a value-add strategy, planning a refinance, or underwriting a disposition several years out. Source
The Biggest Limitations of Cap Rates
Cap rates are useful, but they are not enough on their own. First, they depend on accurate NOI. If the seller’s income and expense numbers are overstated or incomplete, the cap rate becomes misleading. JPMorgan notes that understanding what is driving strong or weak NOI performance is essential when evaluating a building. Source
Second, cap rates do not predict the future. JPMorgan explicitly describes cap rates as a forward-looking, point-in-time measurement, and actual realized returns may differ because of rent growth, GDP, unemployment, economic cycles, and unique deal-level characteristics. Source
Third, cap rates work best for stabilized assets. If you are buying a heavy value-add apartment deal with below-market rents, high vacancy, operational distress, or major deferred maintenance, the in-place cap rate may tell you less than your pro forma underwriting. In those cases, you need to go beyond a cap-rate snapshot and model the business plan in detail. Source
Common Cap Rate Mistakes Multifamily Investors Should Avoid
A common mistake is comparing apartment buildings in completely different markets and assuming the higher cap rate is automatically the better deal. It usually is not that simple, because cap rates reflect local demand, location quality, volatility, and growth expectations. Source
Another mistake is overlooking capital needs. Because cap rates exclude major capital expenditures, a property can appear attractive on paper while hiding expensive near-term repairs that will reduce real-world returns. JPMorgan specifically excludes major capital expenditures from NOI, which is why investors need to review them separately. Source
Finally, investors often rely too heavily on cap rate alone. Strong underwriting should also examine debt structure, occupancy, rent comps, supply pipeline, renovation risk, and exit assumptions. Freddie Mac’s market commentary underscores how supply, vacancy, rent growth, and interest rates all shape multifamily performance beyond a single acquisition metric. Source
Final Thoughts
Cap rates still matter because they give multifamily investors a fast, standardized way to judge pricing and income performance. They help you compare apartment deals, estimate value, and understand how the market is pricing risk. Source
But smart multifamily investors do not stop there. The best use of cap rate is as the starting point in underwriting—not the conclusion. Use it alongside NOI analysis, debt assumptions, cash-on-cash return, and long-term IRR to understand both the property and the business plan behind it. Source Source
FAQ: Cap Rates in Multifamily Real Estate
What is a cap rate in multifamily real estate?
A cap rate is the ratio of a multifamily real estate investing net operating income to its current value or purchase price. It is used to estimate an unleveraged return based on current operations. Source Source
How do you calculate cap rate on an apartment building?
Calculate annual NOI, then divide it by the property’s purchase price or market value. NOI includes recurring income minus operating expenses, but excludes debt service, taxes, and major capital expenditures. Source
Is a higher cap rate always better?
No. A higher cap rate can indicate more risk, weaker market fundamentals, or a less desirable asset. Lower cap rates often reflect stronger locations and lower perceived risk. Source
Do cap rates include mortgage payments?
No. Cap rates are unleveraged and do not include debt service. That is one of the main differences between cap rate and cash-on-cash return. Source
Why do multifamily cap rates change over time?
Cap rates can move because of changes in interest rates, market demand, expected rent growth, supply conditions, economic outlook, and investor sentiment. Freddie Mac and JPMorgan both point to the role of interest rates and market conditions in shaping multifamily pricing. Source Source
