Economic vs. Physical Occupancy in Apartments

Physical occupancy is the share of units that have a tenant. Economic occupancy is the share of the rent the building could earn that it actually collects. A building can be 95% physically occupied and still collect far less than 95% of its potential rent, because of discounts, tenants who do not pay, units given away and leases signed below market. If you are a sponsor, DoorRaise helps you raise equity for a building, and investors will ask which of the two numbers you are quoting.

This post is part of our guide to real estate syndication. It defines both measures, walks through a labelled example, shows where each leak appears in a rent roll and a T-12, and lists questions to ask. Rules are as of October 2026.

What is the difference?

Physical occupancy is simple: occupied units divided by total units. If 95 of 100 units have a tenant on the day you count, physical occupancy is 95%.

Economic occupancy asks a different question: of all the rent this building could earn if every unit were rented at market rent, how much did it actually collect? It starts from gross potential rent (GPR), which is every unit at market rent for the period, and subtracts every dollar that did not arrive.

Lenders and buyers care more about economic occupancy because loan payments and distributions are paid in dollars collected, not in units filled. The cap rate and the income that supports a loan both rest on collected income, as our underwriting basics shows.

What are the leaks between the two numbers?

Five items usually explain the gap.

• Vacancy. Empty units collect nothing. This is the only leak that physical occupancy also counts.
• Loss to lease. The difference between market rent and the rent on an existing lease. A tenant paying less than the unit would now rent for creates a loss even though the unit is full.
• Concessions. Discounts such as free weeks of rent used to win a lease. Rent is billed on paper but not collected.
• Bad debt. Rent charged to tenants who do not pay and whose balance is written off.
• Non-revenue units. Units that are occupied or used but pay no rent, such as a model unit, an office or a unit for an employee.

Each is a normal part of operating a building. The question is how large they are and whether they are rising.

A hypothetical example

This example is hypothetical, for illustration only. The numbers are round and not a benchmark.

Take a 100-unit building where market rent is $1,000 per unit per month. Gross potential rent for one month is $100,000.

Physical occupancy: 95 of 100 units have a tenant, so 95%. But two of those are non-revenue units, so only 93 pay rent.

Economic occupancy: $85,000 collected divided by $100,000 of potential rent, which is 85%.

The building looks 95% full and collects 85% of its potential. That 10-point difference is $10,000 a month, or $120,000 a year, in this made-up example. If a sponsor values the building on the 95% figure and the real income is closer to 85%, the price may be wrong by a lot.

Where do you see each leak in the documents?

Two documents tell the story, and you should read them together. Our rent roll and T-12 guide explains both in detail.

• The rent roll is a unit-by-unit snapshot. It shows which units are occupied, each lease rent, market rent, lease dates and balances owed. You can calculate vacancy and loss to lease directly from it, and see tenants with large unpaid balances.
• The T-12 is a trailing 12 months of income and expenses. It shows what was actually collected each month and often lists lines for vacancy, concessions, bad debt and non-revenue units. It is where you see trends over time.

Then tie them to the bank. Deposits in the seller's bank statements should be close to the income on the T-12. If they are not, ask why.

Why can a high physical number hide weak income?

Because filling a unit is easy if you cut the price. A building can rent 98% of its units by giving large discounts, leasing to tenants who do not pay or letting rents fall below market. The count looks great, and the money does not.

Other ways a snapshot misleads:

• It is a single day. A building with heavy turnover may look full on the day you count.
• Move-ins can be timed ahead of a sale or a sponsor's tour.
• Units "occupied" under a signed lease may not have a tenant paying yet.
• Some sellers report leased units, not occupied ones. Ask which is used.

Look at the trend across at least 12 months and across the property's own history, and compare it with similar buildings nearby, as described in our guide to choosing an apartment market.

What does "stabilized" mean?

You will see the word in decks. A stabilized building is one the sponsor says is operating at a normal, steady level of occupancy and income. There is no official threshold, and the meaning changes by lender and market, so ask for the definition used.

Lenders often use their own test. For example, an agency loan may require a building to maintain a stated level of occupancy and debt coverage for a stated number of months before certain loan terms apply. Check the lender's term sheet instead of relying on a sponsor's use of the word. In a value-add plan, "stabilized" is the date the plan says renovations are done and income has reached its target, which is why it is a hopeful date, not a fact. See the value-add business plan.

What should you ask the sponsor?

Use these questions with any building, and see the free questions to ask a sponsor tool for more.

1. Is the occupancy in the deck physical or economic, and over what period?
2. What were physical and economic occupancy each month for the past 12 months?
3. What are loss to lease, concessions and bad debt as percentages of potential rent?
4. How many units are non-revenue, and why?
5. Does collected rent tie to bank deposits?
6. What occupancy does the model assume after you take over, and what happens at a lower level?
7. How do the numbers change in the stress case? The cap rate guide and financial projections guide explain why the answer matters.

Our take

Our view is that every apartment deal deck should show both numbers side by side, with the formula. When a sponsor shows only the physical figure, it may be unintentional, but it is worth asking. For passive investors, a sponsor who volunteers the gap, explains it and shows the trend is giving you the information you need. A sponsor who dodges the question is telling you something too.

How DoorRaise fits in

DoorRaise helps sponsors raise equity for apartment buildings with 5 or more units under Rule 506(b) or 506(c). It prepares the offering documents from the sponsor's inputs, coordinates escrow with an independent escrow agent named on the deal page, and handles filings. After closing, the property books feature brings monthly figures from a connected property manager into investor reports. DoorRaise does not verify a seller's occupancy figures; sponsors must check the numbers they present.

To get started, create your sponsor page or see the fees.

FAQ

What is the difference between economic and physical occupancy?

Physical occupancy is the share of units with a tenant. Economic occupancy is rent collected divided by the rent the building could earn if every unit were rented at market rent.

How do you calculate economic occupancy?

Divide the rent actually collected for a period by gross potential rent for the same period. Gross potential rent assumes every unit is rented at market rent.

What is loss to lease?

It is the gap between a unit's market rent and what the current tenant pays. It is a leak even when the unit is full, and it often shrinks as leases renew at higher rents.

What is a concession in apartments?

A discount that wins a lease, such as a month of free rent. It can reduce collected income for a year even though the unit looks rented.

Is 95% occupancy good?

It depends on which kind of occupancy, over what period, and what is behind it. A 95% physical figure with large discounts and unpaid rent may be weaker than a lower figure with strong collections.

Do lenders use economic or physical occupancy?

Lenders generally care about collected income and may test occupancy over a period of months. Read the specific loan terms, which vary by lender and program.

Sources

• Fannie Mae, Multifamily fixed-rate mortgage loans
• Fannie Mae, Conventional multifamily properties fact sheet
• 17 CFR 240.10b-5, Employment of manipulative and deceptive devices

This article is general information, not legal, tax or investment advice. Talk to a securities attorney and a CPA about your deal. DoorRaise is not a law firm, broker-dealer, investment adviser or funding portal.