All commercial buildings are not created equal. One of the most overlooked aspects of a building’s value to the tenant is the efficiency of that particular building when compared to another. This efficiency is in relation to the ratio of the space the tenant actually leases within their four walls (the usable square footage) and the amount of space attributed to all common areas of the building including the lobby, hallways, restrooms, common conference rooms, common kitchen areas, interior break areas, work out buildings, showers/lockers, phone and electrical rooms, and any other common use area that, when added to the usable square footage, makes up the rentable square footage. This ratio is called the building “core factor” (also referred to as “load factor”, “loss factor”, or “add-on factor”). Understanding core factors translates directly to the bottom line. Since building costs are typically near the top of the expense list, the savings can be dramatic in comparison to other expenses. Pay attention to the core factor.