The total area for which the tenant pays rent, including common area allocations.
By Angel Campa, Founder · Updated March 2026
Rentable square footage is the multiplier for nearly every financial calculation in the lease: base rent, TI allowance, pro rata share of operating expenses, and parking ratios. A 500 RSF measurement error on a $30/RSF lease means $15,000 per year in overpayment or underpayment. RSF also determines the tenant's share of CAM charges for the entire lease term.
Defined in the "Premises" or "Demised Premises" section, typically within the first 5 pages. May also appear in a rent schedule exhibit or a measurement certification exhibit.
Lextract uses a combination of AWS Textract OCR and Claude AI to identify and extract the rentable area (rsf) from your lease PDF. The AI searches for 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.
Usable Area (USF)
The exact private physical space occupied by the tenant.
Usable square footage (USF) is the private space the tenant actually occupies. Rentable square footage (RSF) adds the tenant's proportionate share of common areas like lobbies, hallways, and restrooms. RSF is always larger than USF, and the difference is captured by the load factor.
Yes. Many leases allow tenants to have the space independently measured using BOMA standards within a specified period after lease execution. If the remeasurement shows a discrepancy, the rent and pro rata share should be adjusted accordingly.
The tenant's pro rata share of building operating expenses is typically calculated as the tenant's RSF divided by the building's total RSF. A larger RSF means a proportionally larger share of CAM, taxes, and insurance pass-throughs.
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