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The 10 Percent Rule: How I Instantly Value Multifamily Real Estate Using NOI

Written by Jai Thompson

I manage a private equity platform deploying 13 to 18 million dollars per quarter across multiple real estate asset classes.

Our model is asset-based, escrow-directed, and execution-driven, allowing us to close in 23 days or less with certainty and clean title flow.

We acquire and operate across:

• Luxury estates
• Single-family residential portfolios
• Multifamily communities
• Hospitality and hotels
• Mixed-use properties
• RV parks and mobile home communities
• Golf resorts and destination assets
• Specialized housing and income portfolios

Capital is structured, operators are paid, reserves are built in, and all disbursements are controlled through escrow.

But no matter how complex the deal structure becomes, the first thing I always look at is NOI.

Because NOI tells me what the property is actually worth.

The Simple Formula That Values a Property

Real estate investors value income property using yield (cap rate).

The formula is simple.

Value = \frac{NOI}{Yield}

If the market yield is ten percent, the math becomes extremely easy.

Ten percent yield means:

Value = NOI ÷ 0.10

Which is the same thing as:

Value = NOI × 10

So when I see a property producing one million dollars of NOI, I instantly know the value is about ten million dollars.

Example: A One Hundred Unit Apartment

Let’s walk through the math exactly the way I teach it.

Step 1 — Calculate Gross Rent

Assume a 100-unit apartment property.

Average rent:

$1,400 per unit

Monthly rent:

100 × $1,400
= $140,000 per month

Annual rent:

$140,000 × 12
= $1,680,000

So the building produces $1,680,000 gross income per year.

Step 2 — Estimate Expenses

Most apartments run about forty percent operating expenses.

Expenses:

$1,680,000 × 40%
= $672,000

Step 3 — Calculate NOI

NOI means Net Operating Income.

Income minus operating expenses.

$1,680,000
− $672,000
= $1,008,000 NOI

So this property produces about $1,008,000 per year in net operating income.

Step 4 — Determine Property Value

If investors in that market require a 10 percent yield, the valuation is simple.

Value = NOI ÷ Yield

$1,008,000 ÷ 0.10
= $10,080,000

So the property is worth roughly:

$10 million.

That number comes directly from the income.

Why Investors Love Increasing NOI

Here is where the real wealth comes from.

If I increase NOI by just $100,000, the property value increases dramatically.

Example:

$100,000 ÷ 0.10
= $1,000,000

That means every $100,000 increase in NOI creates $1 million in property value.

This is why experienced investors focus on income, not just purchase price.

The Stress Test

Before I move forward on a deal, I always stress test it.

The goal is simple:

Make sure the property survives worst-case scenarios.

Scenario 1 — Rent Drops Ten Percent

New rent:

$1,400 × 90%
= $1,260 per unit

New income:

100 × $1,260 × 12
= $1,512,000

Expenses remain roughly:

$1,512,000 × 40%
= $604,800

New NOI:

$1,512,000
− $604,800
= $907,200

Stress Test Valuation

Now apply the same ten percent yield.

$907,200 ÷ 0.10
= $9,072,000

Even with a ten percent rent drop, the property is still worth about nine million dollars.

That means the deal still works.

Debt Coverage Stress Test

Investors also check Debt Service Coverage Ratio (DSCR).

The formula:

DSCR = NOI ÷ Annual Loan Payments

If loan payments are:

$800,000 per year

Then:

$1,008,000 ÷ $800,000
= 1.26 DSCR

Anything above 1.25 DSCR is considered safe by most lenders.

Why This Deal Is Good

This deal works for three reasons.

1 — Strong Income

The property produces over one million dollars in NOI.

2 — Value Based on Income

Even under stress, the property still supports a multi-million-dollar valuation.

3 — NOI Growth Opportunity

If rents increase only $150 per unit, the math changes dramatically.

Rent increase:

$150 × 100 units × 12
= $180,000 new income

Assuming forty percent expenses:

$180,000 × 60%
= $108,000 NOI increase

Value created:

$108,000 ÷ 0.10
= $1,080,000 equity

A small rent increase creates over one million dollars in value.

The Lesson

When I evaluate a multifamily property, I do not start with the asking price.

I start with NOI.

Because NOI tells me:

• What the property is worth
• Whether the deal is safe
• How much value can be created

Once you understand that NOI drives value, real estate investing becomes much simpler.

You are no longer guessing.

You are simply doing the math.

And when the math works, the deal works.

Jai Thompson
Structure over sacrifice. Stewardship over struggle. Every deal builds legacy.