Self-storage occupancy rates

Physical versus economic occupancy

Physical occupancy counts space. It divides occupied rentable square feet by total rentable square feet, and it answers whether the building is full.

Economic occupancy counts money. It divides collected rent by gross potential rent, which is what the facility would collect if every unit rented at its current asking rate with no discounts and no losses.

The gap between the two is the story. A facility that is physically full while economic occupancy lags is filling units with promotions and discounts, which is a different business than a facility that is full at asking rates. A single occupancy figure quoted without saying which one it is should be treated as unverified.

The distinction is not specific to storage. PropRise Primer carries the general commercial real estate treatment in its economic versus physical occupancy entry. What follows here is what changes when the asset is self-storage.

Why the measure behaves differently in storage

Month-to-month leases mean occupancy moves continuously. Tenants arrive and leave on short notice, so a facility can shift by several percentage points within a quarter without anything unusual happening.

That volatility is why direction matters more than level. A twelve-month trend across the competitive set inside a three-mile trade area tells you whether a market is tightening or loosening. One reading tells you almost nothing.

Occupancy also varies by unit type within the same building. Small climate-controlled units and large drive-up units fill at different speeds and respond to different demand, so a building-level figure can conceal a badly mismatched unit mix.

How occupancy is used in underwriting

In a pro forma, stabilized occupancy sets the vacancy deduction against gross potential rent. Sourcing it from the twelve-month trend across nearby facilities is more defensible than adopting a rule of thumb.

In a value-add acquisition, an assumed occupancy climb is usually the largest single driver of the projected return. The assumption only holds if the current vacancy reflects a management problem rather than a demand problem, and the way to tell them apart is existing square feet per capita and the development pipeline in the same ring.

In a development, the absorption curve is occupancy over time, and it depends on how short the trade area actually was before the new square footage arrived.

Reading an occupancy figure critically

Ask which measure it is, what period it covers, whether it is a snapshot or a trend, and whether concessions are included. A physical occupancy snapshot from an offering memorandum, quoted without a date and without the economic figure beside it, is marketing rather than evidence.