When buyers talk about what a multi-family building is worth, they are really talking about income. Not the asking price. Not what another building sold for. Income. That income is called net
Understanding NOI, Cap Rates, and Real Value in Multi-Family Properties
Dated: September 21 2026
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When buyers talk about what a multi-family building is worth, they are really talking about income. Not the asking price. Not what another building sold for. Income. That income is called net operating income, or NOI.
NOI is simply the money the building makes after paying normal expenses. You start with the rent that actually comes in, then subtract things like property taxes, insurance, utilities paid by the owner, maintenance, and management. Whatever is left is the NOI.
Buyers care about NOI because it determines the value of the building. The percentabe between the NOI and the asking price is the cap rate. A cap rate is the way buyers turn that income into a price. Think of it as the rate of return a buyer expects for owning the building.
Here’s the basic idea:
Value = NOI ÷ cap rate
That’s it.
If a building makes $100,000 a year after expenses and buyers are using a 7% cap rate, the value is about $1.4 million. If buyers want an 8% return instead, the value drops to about $1.25 million. Same building, same income — different value because the expected return changed. This is why small changes in income matter.
If you increase NOI by $10,000, you don’t just add $10,000 in value. At a 7% cap rate, that extra income can support roughly $140,000 more in price. That’s why buyers focus so much on expenses and why sellers should too.
It also explains why buyers don’t get excited about “potential” income. They value what’s already happening, not what might happen someday. Clean, realistic numbers sell better than optimistic projections.
From a marketability standpoint, buildings with clear, stable NOI are easier to sell. Buyers feel more confident making offers when income and expenses are easy to understand and supported by actual history. That confidence often shows up as stronger offers and smoother negotiations.
Sellers who prepare their numbers ahead of time — tightening expenses, documenting income, and removing uncertainty — usually attract a wider buyer pool. The building doesn’t just look better on paper; it feels easier to own. At the end of the day, value follows income, but marketability follows clarity. The clearer your NOI story is, the more attractive your building becomes to buyers.
If you’re thinking about selling or just want to understand how buyers will view your numbers, I’m always happy to walk through it with you and keep it simple.
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