Physical Occupancy Says the Building Is Full. Economic Occupancy Says Whether It Pays.

Economic occupancy is the only occupancy number that survives contact with a bank statement. Physical occupancy counts bodies in units; economic occupancy counts dollars against the rent the property could theoretically collect. In a healthy market the two sit within a point or two of each other, and the distinction feels academic. In the market of the past two years, with concessions at multi-year highs, the two have pulled apart, and the gap between them is where cash flow quietly disappears. When physical occupancy and economic occupancy diverge, the physical number is the marketing figure and the economic number is the truth.

Key Takeaways

• Physical occupancy measures occupied units as a share of total units; economic occupancy measures collected revenue as a share of gross potential rent, and it is almost always the lower of the two.

• The gap between them is driven by concessions, loss to lease, and bad debt, all of which leave a unit physically full while collecting less than its scheduled rent.

• In a stabilized property the spread runs 2 to 5 points; a gap wider than 5 points signals a collections, concession, or pricing problem, not a full building.

• Underwrite economic occupancy. A 95% physically occupied asset collecting 87% of gross potential rent is an 87% asset.

What Is the Difference Between Economic and Physical Occupancy?

Physical occupancy is occupied units divided by total units. Economic occupancy is actual revenue collected divided by gross potential rent, the total rent the property would earn if every unit paid full market rate with no vacancy, concessions, or loss. Physical occupancy measures space utilization. Economic occupancy measures financial performance, and it is the one that shows up in net operating income.

The two answer different questions. Physical occupancy answers "is the space being used?" Economic occupancy answers "is the space being paid for at the rate the model assumed?" A unit can be occupied and still fail the second test in several ways: the tenant is in a free-rent month, the tenant signed below the market rent the pro forma used, or the tenant simply is not paying. Each of those keeps physical occupancy at 100% while dragging economic occupancy down. This is why economic occupancy is almost always lower than physical occupancy, and why a full building is not the same as a performing one.

Why Do Economic and Physical Occupancy Diverge?

They diverge because occupancy and collection are two separate events. Filling a unit is a leasing achievement; collecting its scheduled rent is a financial one. Three forces open the gap: concessions that give away rent on occupied units, loss to lease from in-place rents below market, and bad debt from tenants who occupy but do not pay. Each keeps a unit physically full while it collects less than gross potential rent.

Concessions are the loudest driver right now. A unit leased with one month free on a twelve-month term is physically occupied for the full year but collects only eleven months of rent, an 8.3% haircut on that lease that never touches the physical occupancy figure. This is not a fringe case. When a large share of leases carry free rent depending on the source and market, the economic occupancy of a physically full building sits meaningfully below 100%.

The last row matters: economic occupancy can exceed physical occupancy when a property collects meaningful non-rent income relative to its rent roll, which is why the metric is a ratio of dollars, not a headcount. Loss to lease and net effective rent are the two concepts that make the gap legible, and both live in the leases, not the occupancy report.

How Big Should the Gap Be, and When Is It a Warning?

In a stabilized property the spread between physical and economic occupancy runs 2 to 5 points, reflecting normal vacancy loss, minor bad debt, and light concessions. A gap inside that band is routine. A gap wider than 5 points is a signal, not a footnote: it points to heavy concessions, a collections problem, or asking rents set above what the submarket will pay.

The direction of the gap tells you where to look. A wide gap on a property with high physical occupancy usually means concessions or below-market in-place rents, the building is full because it is cheap. A wide gap with mediocre physical occupancy and rising delinquency points to bad debt and tenant quality. As one asset manager's rule of thumb puts it, "a building can be full and broke at the same time, and the occupancy report will never tell you which one you own." The number that tells you is economic occupancy, tracked against physical occupancy month over month.

How Is Economic Occupancy Calculated? A Worked Example

Economic occupancy equals collected revenue divided by gross potential rent. Take a 200-unit property with a market rent of $1,650 per unit per month. Gross potential rent is 200 units times $1,650 times 12 months, or $3,960,000 a year. That figure is the denominator, the income the property would produce at full occupancy, full market rent, and full collection.

Now subtract what the building gives up. Ten units sit vacant all year: 10 times $1,650 times 12 is $198,000 of vacancy loss. Sixty new or renewing leases carry one month of free rent: 60 times $1,650 is $99,000 of concessions. In-place rents on the remaining occupied units average $60 below market across 130 units for the year: 130 times $60 times 12 is $93,600 of loss to lease. Bad debt runs 1.5% of gross potential rent: 0.015 times $3,960,000 is $59,400.

Collected revenue is $3,510,000. Economic occupancy is $3,510,000 divided by $3,960,000, or 88.6%. Physical occupancy, meanwhile, is 190 occupied units divided by 200, or 95%. The gap is 6.4 points. The building shows as 95% full, but it collects at 88.6%, and the 6.4-point spread is roughly $252,000 of income the physical number never mentions. Underwrite the 95% and the effective gross income is overstated by a quarter of a million dollars before a single expense assumption is made.

Which Number Should You Trust for Underwriting?

Trust economic occupancy, because it is the number that becomes net operating income. Physical occupancy tells you the leasing team did its job. Economic occupancy tells you whether that job produced cash. Every dollar in a valuation traces back to collected revenue, and collected revenue is what economic occupancy measures. Physical occupancy is a leading indicator; economic occupancy is the result.

The practical discipline is to underwrite both and watch the spread. Physical occupancy warns you early when leasing slows. Economic occupancy confirms whether the rents behind that leasing are real. A seller's marketing package leads with physical occupancy for a reason, and a buyer who accepts it as the operating figure is underwriting the building the seller wishes they owned. The reconciliation, comparing collected revenue to gross potential rent line by line, is the same discipline that separates a real rent roll from a hopeful one.

Frequently Asked Questions

What is economic occupancy? Economic occupancy is the percentage of a property's gross potential rent that it collects, calculated as collected revenue divided by gross potential rent. It accounts for vacancy, concessions, below-market rents, and bad debt, so it is almost always lower than physical occupancy and is the figure that drives net operating income.

Why is economic occupancy lower than physical occupancy? Economic occupancy is lower because a unit can be physically occupied while collecting less than its scheduled rent. Concessions, in-place rents below market, and tenants who occupy but do not pay all reduce collected revenue without reducing the occupied-unit count, so the dollar-based number falls below the headcount-based one.

What is a normal gap between physical and economic occupancy? In a stabilized property the gap typically runs 2 to 5 percentage points, reflecting routine vacancy loss and light concessions. A gap wider than 5 points signals heavy concessions, a collections problem, or asking rents above market, and warrants investigation before the physical number is trusted for underwriting.

Which occupancy metric should investors use? Investors should underwrite economic occupancy, because it is the figure that converts into collected revenue and net operating income. Physical occupancy is a useful leading indicator of leasing momentum, but only economic occupancy reflects the cash the property produces.

Conclusion

Physical occupancy and economic occupancy are not two versions of the same fact. One counts occupied units and one counts collected dollars, and in a market running record concessions the two have separated by enough to change what a property is worth. The physical number is the one on the marketing flyer. The economic number is the one on the operating statement, and it is the one a valuation has to answer to.

For the operator, the rule is simple: fill the building on physical occupancy, but underwrite it on economic occupancy, and watch the spread between them as a live diagnostic. When the gap widens past the normal band, the building is telling you something the occupancy report alone will never say, that it is fuller than it is paid.

Related

• Economic Occupancy

• Physical Occupancy

• Loss to Lease

• Net Effective Rent

• Effective Gross Income

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