How to Find Value on Multi-Family Properties

TLDR

There are three ways to value a property: sales comps, replacement cost, and income. Single family uses comps. Multi-family uses income. The 1 percent rule is shorthand for a roughly 7 percent cap rate, and it tells you what a property should sell for based on what it rents for.

Table of Contents

• Three Ways to Value a Property
• The Income Approach
• The 1 Percent Rule, Explained
• The Cap Rate Formula
• Real Math on a Quadplex
• When the 1 Percent Rule Changes

Three Ways to Value a Property

Every building on land can be valued three ways.

1. Sales comparable sales. That house looks like my house. Same neighborhood, similar square footage, similar features. It sold for 300,000 dollars. If I get my house to similar condition, mine will sell for around 300,000 too.
2. Replacement cost. Land is worth 20,000 dollars. A new house on it costs 240,000 to build. So the property is worth around 260,000.
3. Income approach. What cash does this property generate? Value is a multiple of that cash.

Single family homes mostly use option one. Mostly sales comps. That is how you have always run comps on flips.

Multi-family uses option three. Especially as the building gets bigger. The value of a quadplex is about what it brings in, not what the house down the street sold for.

The Income Approach

A multi-family home, especially once you get past duplex size, is valued by what kind of income it generates.

If you have a quadplex and each of the four units rents for 1,000 dollars a month, that building brings in 4,000 dollars a month. An investor buying that building cares about the income, not the square footage per side. So the value is priced off the rent.

That is where the 1 percent rule comes from.

The 1 Percent Rule, Explained

The 1 percent rule says that a property’s rent should be roughly 1 percent of its value.

Rents at 4,000 a month means a property worth around 400,000. That is your quick-math filter on whether an income property is in the right ballpark.

The rule does not apply as cleanly on single family homes in every area, but it works in some markets. The markets where the 1 percent rule works on single family are usually the best cash-flow markets.

Pro Tip

The 1 percent rule is a shortcut for a 7 to 8 percent cap rate on a B-class property. That math came from a time when interest rates were low. With rates closer to 7 percent now, the shortcut is less forgiving than it used to be.

The Cap Rate Formula

Capitalization rate, or cap rate, is the clean version of the 1 percent rule.

Cap Rate = NOI divided by Property Value

That gives you the annual yield on the property if you paid all cash. A 7 percent cap rate means a 7 percent annual return on the purchase price before debt.

Rearranged, you can solve for value:

Property Value = NOI divided by Cap Rate

If you know the net operating income and the market cap rate, you can back into what a property should trade for.

Real Math on a Quadplex

Here is the full walkthrough.

Step 1: Gross Rent

Quadplex at 1,000 per unit per month. 4 units. Gross rent: 4,000 per month. Or 48,000 per year.

Step 2: Operating Expenses

You cannot use gross rent as NOI. You have to subtract the real cost of operating the building. I use a rough 40 percent expense ratio on rent as quick math, which accounts for:

• Property management (about 10 percent)
• Vacancy
• Maintenance
• Capex (roof, HVAC, big ticket items)
• Taxes
• Insurance

So of the 4,000 a month, about 60 percent is NOI. 2,400 a month. Or 28,800 per year.

Step 3: Apply the Cap Rate

At a 7 percent cap rate:

Value = 28,800 / 0.07 = about 411,000

That matches the 1 percent rule almost exactly. Rents of 4,000 a month yielding a value around 400,000.

Duplex Example

Duplex where each side rents for 1,200 a month. 2,400 a month total. Apply the same math:

• Gross: 28,800 per year
• NOI at 60 percent: 17,280
• Value at 7 percent cap: about 247,000

The 1 percent rule gives 240,000. Close enough for a quick estimate.

Key Concept

NOI is rent minus operating expenses, but not minus debt service. Your principal and interest payment is not an operating expense for cap rate purposes. Keep it separate or your cap rate math will be off.

When the 1 Percent Rule Changes

The 1 percent rule is the baseline for a B-class property. It moves up or down based on the quality of the neighborhood.

• C-class or rougher areas. You want a better cap rate because the risk is higher. In some rough markets I used to apply a 2 percent rule, meaning rent was 2 percent of value. A property renting for 4,000 a month, I was buying for 200,000. Deep discounts are how you compensate for the extra risk.
• A-class neighborhoods. You will not find 1 percent rents in those markets. Values are too high relative to rent because there is more appreciation potential. Expect less than 1 percent rule and pay for the location.

The 1 percent rule is a starting point, not a ceiling. Adjust up in tougher areas, adjust down in A-class markets.

Interest Rate Shifts Matter

The 1 percent rule and the 7 percent cap rate were calibrated in a time when borrowing was cheap. With mortgage interest rates at 7 percent or higher, the cap rate you need for a deal to actually cash flow goes up too.

If you are buying at a 7 cap and borrowing at 7 percent, you are break-even at best. The difference between cap rate and interest rate is roughly your cash flow margin. In this rate environment, you need a better cap rate on purchase or a great deal on the front end.

FAQ

Does the 1 percent rule still work in 2026?

As a rough filter, yes. As a cash-flow guarantee, no. At current interest rates, a property that hits exactly 1 percent on rent is barely break-even on cash flow. You either need the property below market on purchase, rents above market, or a conservative underwrite that assumes the gap closes over time.

What’s the difference between cap rate and cash-on-cash return?

Cap rate is NOI divided by purchase price, which assumes all cash. Cash-on-cash is your actual cash flow after debt service divided by the cash you put into the deal. Cash-on-cash is the return you see in your pocket. Cap rate is the return the building itself generates.

Why do single family homes use comps instead of the income approach?

Single family buyers are mostly owner-occupants, not investors. They care about the house and neighborhood, not the rental income. So the comparable sales price is what drives value. Multi-family buyers are mostly investors, and investors buy cash flow, so income drives value.

How do I get a reliable cap rate for my area?

Talk to a commercial broker or look at recent multi-family sales in your market. Brokers track market cap rates by class and size. You can also check syndication deal decks, which publish the cap rates they are targeting.

Just starting out. Should I chase multi-family for the income approach, or stick with single family?

Single family is easier to get financed, easier to exit, and easier to understand. Learn comps and flips first. Pick up a duplex or fourplex for a house hack if you qualify for an FHA loan. Jumping straight into bigger multi-family as a beginner means learning commercial financing, cap rate math, and building management all at once.