Physical occupancy is the share of your rentable space that has a tenant in it. Economic occupancy is the rent you actually take in, divided by what the building would earn if every unit were rented at today's street rate.
The first tells you how full your facility is. The second tells you how much of its earning power you're collecting. That's the whole difference between physical occupancy vs economic occupancy. A facility can be 92% full and still fall well short of its potential, because physical occupancy never sees discounts, below-street rents or tenants who don't pay.
Physical occupancy vs economic occupancy, side by side
Physical occupancy is counted two ways, by units or by square feet. Square feet is the better base, since one empty 10x30 costs you more than one empty 5x5. It's also the base the REITs report on. Public Storage's same-store facilities were 92.4% occupied by square foot at June 30, 2026 (Public Storage Q2 2026 10-Q).
Economic occupancy needs two numbers:
- Gross potential rent. Every unit, rented or empty, priced at its current street rate, for the month.
- Rent you took in. What tenants paid, after move-in specials and other concessions.
There's a catch in the second number. Many management reports compute economic occupancy from rent charged, not rent collected. Rent charged ignores delinquency. Rent collected catches it. Know which one your report uses before you compare it with anything.
A worked example on one 50,000 NRSF facility
Here's one facility, worked both ways. Swap in your own figures.
Take 50,000 rentable square feet with a street rate of $1.20 a foot a month. 46,000 feet are rented, so physical occupancy is 92%.
Gross potential rent is 50,000 times $1.20, or $60,000 a month.
Now the rent. The tenants in place average $1.15 a foot, because some moved in on old rates and haven't had an increase. That's a rent roll of $52,900. This month's move-in specials knocked off $1,500, and $2,400 billed to tenants went unpaid.
| Measure | Calculation | Result |
|---|---|---|
| Physical occupancy | 46,000 / 50,000 | 92% |
| Economic, rent charged | $51,400 / $60,000 | 85.7% |
| Economic, rent collected | $49,000 / $60,000 | 81.7% |
The collected figure sits 10.3 points under physical occupancy. Here's where the $60,000 went:
| Where the potential went | Monthly dollars | Points of potential |
|---|---|---|
| Empty space, 4,000 feet at street | $4,800 | 8 |
| In-place rents below street | $2,300 | 3.83 |
| Move-in specials | $1,500 | 2.5 |
| Unpaid rent | $2,400 | 4 |
| Total | $11,000 |
Physical occupancy only shows the first line. The other three come to $6,200 a month, or $74,400 a year if this month repeats, and none of them move the occupancy number at all.
Each one has a different fix. Empty space is a move-in problem, the job of your marketing. Below-street rents are a rate-increase question. Specials are a pricing decision. Unpaid rent is a collections process.
What the REIT filings show about the gap
Public Storage's latest quarterly filing shows each part of that gap at scale.
On specials, it names its usual offer as "$1.00 rent for the first month," and it gave $17,705,000 in promotional discounts at its same-store facilities in the second quarter of 2026 (Public Storage Q2 2026 10-Q). None of that shows in an occupancy percentage.
On rent per foot, it reports two measures. Realized rent per occupied foot, which counts discounts, was $21.89 for the quarter. Contract rent per occupied foot at June 30, which leaves out discounts and rent written off as uncollectible, was $22.09 (Public Storage Q2 2026 10-Q). One is a quarterly average and the other a single date, so the comparison is loose. Still, realized lands under contract, which is the direction you'd expect.
The filing also shows why economic occupancy can mislead at a mature facility. Tenants moving in during the quarter signed at $13.49 a foot a year, while tenants moving out had been paying $19.34 (Public Storage Q2 2026 10-Q). The tenants leaving paid about 43.4% more per foot than the ones replacing them.
When long-staying tenants have had years of increases, in-place rent can run above street. Measured against street rates, economic occupancy can then match or even top physical occupancy. That doesn't mean nothing's leaking. It means the street rate is the wrong yardstick for those tenants, so read the in-place rent line beside it. Move-in pricing belongs in the same conversation as your marketing plan.
How to pull both numbers from your management software each month
- Pull occupancy by square foot, not just units, as of the last day of the month.
- Pull gross potential rent at current street rates. If your system only shows potential at in-place rents, build it from the unit list: rentable feet by unit type, times that type's street rate.
- Pull scheduled rent from the rent roll for the occupied units.
- Pull the concessions and discounts granted that month.
- Pull rent collected that month, separate from late fees and admin fees, which aren't rent.
- Work out economic occupancy on charged rent and on collected rent, and write both next to physical occupancy.
- Split the gap into the four lines from the table above. Watch which line grows month to month.
Running several facilities? Do this for each property. A portfolio average can hide the one store giving a free month to half its move-ins.
Mistakes that cost money
Celebrating occupancy you bought. A free month fills a unit fast. If physical occupancy climbs while economic occupancy stays flat, the specials are paying for the move-ins.
Counting late fees as rent. Public Storage leaves them out of its rent measures. Its Q2 2026 10-Q says "Late charges are dependent upon the level of delinquency." Fold them in and a collections problem starts to look like income.
Using a stale street rate. Gross potential is only as good as the street rates behind it. If you haven't updated them since spring, the economic number is measured against a building that no longer exists.
Comparing your number with someone else's. One operator's economic occupancy uses rent charged, another's uses collected, and a third uses in-place rent as potential. Compare your facility with itself, month over month.
This month, pull your rent roll and your street rates and work out the below-street line. It's usually the one nobody has looked at.