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Lease space on a multi-tenant floor

Doug Allison
January 30, 2014

We are leasing space on a multi-tenant floor and would like to know if there is an industry standard with regard to the interior gross area (IGA) and how the boundary is drawn in this situation. Currently we have been drawing the boundary to include only the area that we actually occupy. None of the common areas outside of our space are included in our measurements. Should the IGA boundary be drawn for the entire floor, regardless if there are multiple tenants, so that we do capture the common areas? Would we then ignore any spaces that are leased to other tenants or should we also capture those spaces which could then be classified as "Excluded - Third Party?

Adam Fingret
Extreme Measures Inc.
January 30, 2014

Hi Doug,

First off, it is important to understand that BOMA 2010 contains its own definition for IGA and it isn't necessarily identical to your understanding and/or use of the term.

BOMA uses IGA as a means to an end. IGA is like a master boundary line that encloses all measurable spaces on a given floor. IGA does not have any deductions, adjustments or calculations. It is the raw perimeter of the floor, measured according to BOMA's IGA boundary conditions. Once drawn, the IGA boundary can be used to inform the creation of occupant and common areas etc.

So, under BOMA 2010, yes you should measure the IGA of the floor, but this is really one step toward calculating Occupant and Rentable Areas. These are the figures you would typically use for planning and leasing activities.

It sounds as though you are only able to accurately measure your Occupant Area, since you don't have access to other spaces in the building. Ask your landlord what your load-factor (or gross-up) is. You can then multiply this figure against your Occupant Area (which uses the IGA boundary) to generate a Rentable Area.

Hope this helps.

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