The ratio mapping usable to rentable space to account for common areas.
Also known as: Core Factor, Common Area Factor
By Angel Campa, Founder · Updated March 2026
The load factor reveals the hidden premium tenants pay for common areas. A building with a 20% load factor means for every 1,000 usable square feet, the tenant pays rent on 1,200 RSF. Comparing load factors between competing buildings is essential for evaluating true occupancy cost. Office buildings typically range from 10% to 20%, and anything above 20% should raise questions about measurement methodology.
Sometimes explicitly stated in the Premises section or measurement exhibit. More often, it must be calculated by dividing RSF by USF and subtracting one. Some landlords avoid disclosing the load factor directly.
Lextract uses a combination of AWS Textract OCR and Claude AI to identify and extract the load factor from your lease PDF. The AI searches for the field name and common aliases like "Core Factor", "Common Area Factor" across all pages of the document, then assigns a confidence score based on OCR quality and extraction certainty. Fields with lower confidence are flagged for human review.
Landlord Name
The legal corporate name of the landlord/lessor.
Tenant Name
The legal corporate entity leasing the premises.
Guarantor Name
The entity or individual providing financial backing for the tenant.
Premises Address
The full physical address of the leased space.
Suite/Unit Number
The specific identifier for the tenant's space within a multi-tenant building.
Rentable Area (RSF)
The total area for which the tenant pays rent, including common area allocations.
Most multi-tenant office buildings have load factors between 12% and 18%. Single-story buildings tend to be more efficient (10-12%), while high-rise towers with large lobbies and mechanical floors can reach 18-22%. Industrial properties typically have load factors under 5%.
Divide the rentable square footage by the usable square footage, then subtract 1 and multiply by 100. For example: (11,500 RSF / 10,000 USF) - 1 = 0.15, or a 15% load factor.
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