I'm supporting The HUB RiNo Station project (1000100418 - LEED v4 BD+C: CS ). We are pursuing Green Power and Carbon Offsets credit. Currently, I am using the following calculation steps to determine our Total Required Green Power Quantity for this LEED-CS Project.

• 437,858.80 SF (Exterior Gross Floor Area) - 147,890.92 SF (Parking Areas within building footprint) = 289,968.80 SF (Net Exterior Goss Floor Area)

• [289,968.80 SF (Net Exterior Goss Floor Area) - 239,408.12 SF (Usable Are)]  / 289,968.80 SF (Net Exterior Goss Floor Area) = .17437 x 100 = 17.44% (Core and Shell square footage)

• 17.44% (Core and Shell square footage)  x  602,651.0 kWh/ year  x  5 years = 525,421.27 kWh

AND

• 17.44% (Core and Shell square footage)  x  10,350.9 Therm  x  5 years = 9,024.43 Therm

Did we go about calculating core and shell area percentage correctly? Is there an alternative method that would result in a more accurate core and shell area percentage and Total Required Green Power Quantity?​

Thanks