Definition
The actual floor space a tenant can occupy, excluding common areas like lobbies and hallways. In commercial leases, this differs from rentable square footage through a multiplier that ensures you pay for space you can't actually use.
Example Usage
Their office had 3,000 usable square feet but paid rent on 3,450 rentable square feet once the common area factor was applied.
Origin
Commercial space measurement standards from Building Owners and Managers Association (BOMA), formalized in 1915
Fun Fact
The difference between usable and rentable square footage, called the 'loss factor' or 'load factor,' typically ranges from 10-20% but can exceed 30% in some buildings.
Source: BOMA office space measurement standards
Related Terms
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