Rentable square footage is the square footage figure a tenant's rent is calculated against, typically equal to usable square footage plus a prorated share of common areas in multi-tenant buildings. This is functionally the same concept as net rentable area, and the term you'll most commonly see referenced directly in a lease's rent calculation.
Rentable square footage in practice
In single-tenant industrial buildings, rentable square footage is often the same or very close to usable square footage, since there's minimal shared common area to allocate. In multi-tenant buildings, rentable square footage includes a load factor adjustment reflecting the tenant's proportional share of lobbies, shared hallways, or other common spaces — meaning your rent is calculated on more square footage than you can physically use exclusively.
What to watch for before committing
Measurement standard verification
Confirm which measurement standard, such as BOMA, the landlord used to calculate rentable square footage.
Load factor reasonableness
In multi-tenant buildings, compare the load factor applied against typical ranges for similar buildings.
Independent verification for significant leases
For significant leases, consider independently verifying rentable square footage rather than relying solely on landlord-provided figures.
Consistency across competing offers
Ensure you're comparing rentable square footage consistently across multiple building options during site selection.
Impact on total rent calculation
Calculate your total rent based on the actual rentable square footage figure specified in your lease, not just the usable space you'll occupy.
Single-tenant vs multi-tenant relevance
Recognize this distinction from usable square footage matters most in multi-tenant buildings, less so in single-tenant industrial space.
When you need to know this
- Calculating total rent obligation — understanding what square footage figure your rent is actually based on
- Comparing multi-tenant building options — normalizing rent comparisons that involve different load factors
- Negotiating lease terms — verifying measurement methodology before agreeing to a specific figure
- Evaluating lease accuracy — confirming quoted square footage figures match your actual measured space
Frequently asked questions
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