Overwrite space/zone floor area in OpenStudio

I've got a 2 story mall concourse with very large openings (short story: on the second floor you can only walk at the perimeter, but otherwise see here) and that is conditioned by the same HVAC system. I've ended up defining it as a single space and thermal zone.

Basically I want to end up calculating correctly everything that needs to be calculated, including people, plug loads, and design specification outdoor air. I have my occupancy defined at people/ft², my plug loads as W/ft² etc.

I'd like to override the space area so that I end up with something like 1.6 times what it should be, and I'm wondering if there's a way to do this in OpenStudio or I'm left having to calculate my plug loads, outside air CFM, etc as a side calc?

(Knowing that this will also require some proper explaining for the reviewing authority as to why the output reports mentions LPDs that are out of range etc...)

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Lights, 189.1-2009 - Office - ClosedOffice - CZ1-3 Lights, !- Name 90.1-2007 - Office - ClosedOffice, !- Zone or ZoneList Name Office Bldg Light, !- Schedule Name Watts/Area, !- Design Level Calculation Method , !- Lighting Level {W} 11.8403014583807, !- Watts per Zone Floor Area {W/m2} , !- Watts per Person {W/person} , !- Return Air Fraction 0.7, !- Fraction Radiant 0.2; !- Fraction Visible

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