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You can have every unit occupied — and still miss your revenue targets.
It is a disconnect that surprises newer operators and frustrates seasoned ones: the building is “full,” but the rent roll tells a different story.
This is economic vacancy — and it is one of the more underestimated risks in multifamily investing.
What Is Economic Vacancy, Really?
Economic vacancy refers to occupied units that are not generating the full scheduled rent. On paper, these units are leased. But in practice, they are underperforming financially … and they quietly erode NOI if you are not paying attention.
Here are some common culprits:
- Bad Debt: Rent is owed but never collected.
- Loss to Lease: Actual rents are below market because leases have not caught up.
- Concessions: Discounts, free rent, or incentives eat into real revenue.
- Non-Revenue Units: Units used by staff or offered rent-free for various reasons.
Even in stabilized assets, economic vacancy can range from 3% to 5% … and higher if left unmanaged.
The Real Risk: Assumptions vs. Reality
Too often, pro forma models assume perfect collections and instant lease-ups at market rents. But in the real world:
- Not every tenant pays.
- Rent increases take time.
- Market comps do not guarantee market rents.
If your business plan depends on squeezing every dollar from every unit without accounting for economic vacancy, you are likely overstating your returns.
How To Minimize Economic Vacancy
Here is what I have found effective in managing this silent killer of NOI:
- Screening Matters: Proper tenant screening and selection is your first defense against bad debt. It is not just about occupancy – it is about quality of occupancy.
- Stay Close to the Market: Frequent market surveys help ensure rents are competitive – not too low (loss to lease), not too high (which leads to concessions or turnover).
- Retention Is Revenue: Taking care of existing tenants reduces turnover and the need for costly concessions. In a tight market, renewals are your most efficient income stream.
- Underwrite Conservatively: Always bake in economic vacancy — typically 3–5% — in the models. You’d rather be pleasantly surprised than scrambling to explain underperformance.
A Full Building Is Not the Whole Story
Economic vacancy is a reminder that headline occupancy does not equal financial performance. If you want your assets to perform consistently, you need to look beyond the unit count and focus on what is actually hitting the bank account.
Because in this business, what you collect matters more than what you charge.
Vessi Kapoulian
Breaking down multifmaily underwriting one step at a time to create educated and empowered investors
P.S.
If you are evaluating an investment and need a second set of eyes, I am here to help. Send me a message and we’ll schedule a complimentary call.
P.P.S. And if you are ready to do a deeper dive and learn how to analyze deals on your own from beginning to end with confidence and ease, go to masteringmultifamilyunderwriting.com or message me on how to get started today.