The ratio of rentable square footage to usable square footage, expressed as a multiplier, representing the tenant's proportionate share of common areas such as lobbies, corridors, and restrooms added to their private space.
Also called the "add-on factor" or "loss factor," the load factor converts usable square footage (the space a tenant actually occupies) into rentable square footage (the basis for rent calculation). A load factor of 1.15 means a tenant with 10,000 usable square feet pays rent on 11,500 rentable square feet. BOMA standards govern how landlords measure and allocate common area square footage. Higher load factors in multi-tenant buildings can significantly inflate rent costs; tenants should independently verify measurements and compare load factors across competing buildings.
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