Cap Rate Explained: What It Means for Multifamily Investors

The Cap Rate Formula

Cap rate is defined as the ratio of a property's net operating income to its current market value or purchase price. It represents the unlevered return on a property as if it were purchased with all cash — no mortgage, no financing costs.

Conversely, if you know a property's NOI and the prevailing market cap rate, you can back into the implied value: Value = NOI ÷ Cap Rate. This is how appraisers and buyers establish what a property is worth in the income approach to valuation.

What Drives Cap Rates?

Cap rates are shaped by both macro and property-level factors. Understanding which forces are at work in a given market and deal helps you assess whether an asking cap rate is fair.

• Interest rates — cap rates and interest rates tend to move together over time, though not in lockstep. When borrowing costs rise, buyers require higher cap rates to maintain positive leverage. During the 2022–2023 rate cycle, many markets saw cap rate expansion of 100–200 basis points as debt costs jumped.
• Location and market quality — gateway markets (New York, Los Angeles, Seattle, Miami) historically trade at lower cap rates (3.5–5%) than secondary and tertiary markets (5.5–8%+), reflecting perceived rent growth stability and liquidity.
• Property class and condition — Class A properties (newer, institutional-quality) command tighter cap rates than Class B or C assets. Investors pay a premium for lower execution risk.
• Rent growth expectations — markets with strong rent growth potential attract buyers willing to accept lower going-in cap rates because they are pricing in future NOI growth.
• Supply and demand for capital — when institutional capital flows heavily into multifamily (as it did 2019–2021), competition drives cap rates down. Capital pullback expands them.

Market Cap Rates by Property Class

Cap rates vary significantly by asset class and geography. The following ranges reflect general market conditions as of mid-2025 and should be calibrated to your specific submarket using recent comparable sales data.

These ranges are for general reference only. Always verify local market cap rates using recent comparable sales from a local broker or CoStar data for your specific submarket.

Backing Into Value from NOI

One of the most powerful uses of cap rate is working backward from NOI to establish a target acquisition price. If you know the property's stabilized NOI and the prevailing cap rate for comparable assets, you can derive a maximum price you should be willing to pay.

If a broker is asking $3.8M for a property with a $200,000 NOI, they are pricing it at a 5.26% cap rate. You need to ask: is this a 5.26% cap rate market? And if so, is this a 5.26% cap rate property? Anchoring your offer to independently derived NOI and market cap rates keeps emotion out of the negotiation.

Cap Rate Compression: What It Means and Who Benefits

Cap rate compression occurs when cap rates fall — meaning prices rise relative to income. Compression benefits owners and sellers: if you bought a property at a 7% cap rate and the market compresses to 5.5%, the same NOI is now worth significantly more.

Cap rate expansion works in reverse, and is the primary driver of value destruction in rising rate environments. Buyers who paid peak prices at 4–4.5% cap rates in 2021 faced significant mark-to-market losses as cap rates expanded 150–250bps by 2023–2024.

The Limitations of Cap Rate

Cap rate is useful but incomplete. Relying on it as a standalone metric leads to poor investment decisions. Here is what cap rate does not tell you:

• It ignores financing — cap rate measures unlevered returns. Your actual cash-on-cash return depends entirely on your loan terms. A 6% cap rate deal with 7.5% debt costs is cash-flow negative. Cap rate alone will not tell you this.
• It is a point-in-time snapshot — cap rate captures today's NOI relative to today's price. It says nothing about future rent growth, upcoming capex needs, or lease rollover risk.
• Pro forma vs. trailing — the cap rate in the OM is almost always calculated on pro forma NOI. A 6% cap rate headline built on aggressive rent assumptions may be a 4.5% cap rate on trailing actuals. Always recalculate.
• It excludes capital expenditures — NOI does not account for capex. Two properties with identical NOIs and cap rates can have dramatically different long-run economics if one requires $500,000 in deferred maintenance.
• It does not capture value-add upside — a property trading at a low going-in cap rate on current rents may deliver a strong IRR if rents can be pushed significantly. Cap rate alone does not capture this trajectory.

Use cap rate as a quick filter and a pricing anchoring tool, not as a substitute for full cash flow modeling. A complete underwrite includes cash-on-cash return, debt service coverage ratio, and IRR over your projected hold period.

What Is a “Good” Cap Rate?

There is no universally good cap rate — the right cap rate depends entirely on your investment thesis, cost of capital, and risk tolerance. A few principles:

• Positive leverage — for the deal to be cash-flow positive, your cap rate should exceed your all-in mortgage constant (annual debt service divided by loan amount). If your loan constant is 7.2%, buying at a 5.5% cap rate means negative leverage.
• Risk-adjusted return — a 5% cap rate on a stabilized Class A property in a strong market may be a better risk-adjusted investment than an 8% cap rate on a Class C property in a declining market with high deferred maintenance.
• Hold period matters — if your strategy is to buy, improve NOI aggressively, and sell at a compressed cap rate in five years, a lower going-in cap rate may still deliver a strong IRR.