Gross square footage is the total floor area of an entire building measured from the outside walls, including all common areas, mechanical rooms, and other non-usable space. This is the broadest measurement figure, larger than both net rentable area and usable square footage, and is typically used for overall building sizing and permitting purposes rather than rent calculations.
Gross vs rentable vs usable square footage
| Measurement | What it captures |
|---|---|
| Gross square footage | Entire building, outside wall to outside wall |
| Net rentable area | Tenant's usable space plus common area allocation |
| Usable square footage | Tenant's exclusively occupied space only |
What to watch for before committing
Not the basis for rent calculation
Recognize gross square footage is generally not what your rent is calculated against — confirm which measurement basis actually applies to your lease.
Building sizing context
Use gross square footage appropriately when comparing overall building scale, such as for permitting or investment analysis purposes.
Marketing material clarity
Confirm which square footage figure marketing materials are citing, since gross, rentable, and usable can all appear in different contexts.
Consistency in comparisons
When comparing buildings, ensure you're using consistent measurement types rather than mixing gross and rentable figures.
Relevance to investment analysis
For investment purposes, understand how gross square footage relates to overall building value and development cost metrics.
Confirming actual applicable figure
Always clarify with your broker or landlord exactly which square footage measurement is being referenced in any specific context.
When you need to know this
- Evaluating overall building scale — understanding total building size for investment or planning purposes
- Comparing properties for acquisition — using consistent gross square footage figures across candidate properties
- Understanding building permitting context — recognizing how gross square footage relates to municipal permitting requirements
- Avoiding confusion in lease negotiations — clarifying which square footage measurement actually applies to your specific rent calculation
Frequently asked questions
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