Loss factor is the percentage of rentable square footage that consists of common areas rather than a tenant's exclusively usable space. It's essentially another way of expressing the same relationship captured by load factor, describing how much of what you're paying rent on isn't space you exclusively occupy.
Loss factor vs load factor: same relationship, different framing
| Metric | How it's expressed |
|---|---|
| Load factor | Multiplier — usable × load factor = rentable |
| Loss factor | Percentage — the share of rentable that isn't usable |
What to watch for before committing
Consistent terminology usage
Clarify whether a broker or landlord is quoting load factor or loss factor, since confusing the two can lead to miscalculating your actual space.
Loss factor reasonableness
Compare the quoted loss factor against typical ranges for similar building types to assess whether it seems reasonable.
Impact on true occupancy cost
Calculate how the loss factor affects your true cost per usable square foot, not just the headline rentable rate.
Verification of underlying measurements
For significant leases, consider verifying the underlying usable and rentable square footage figures behind the stated loss factor.
Comparing across buildings consistently
When comparing options, ensure you're using consistent loss factor or load factor framing rather than mixing the two.
Building type expectations
Recognize that loss factor tends to be minimal in single-tenant industrial buildings and higher in multi-tenant or office-heavy properties.
When you need to know this
- Comparing multi-tenant building options — understanding how much of your rentable square footage is actually usable space
- Calculating true cost per usable square foot — factoring loss factor into your effective occupancy cost calculation
- Evaluating office-heavy vs pure industrial buildings — recognizing typically higher loss factors in office-oriented spaces
- Clarifying broker or landlord terminology — ensuring you understand which metric, load or loss factor, is being referenced
Frequently asked questions
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