The Activity Envelope shall be defined to ensure the preservation of at least ninety-five (95) percent of the acreage historically used for production of food for humans, or hay, grain and other feed crops for livestock. If compliance with that standard would require a dwelling or other structure to be constructed in another Constrained Area that would create an inconsistency with this Land Use Code or the Pitkin County Comprehensive Plan then the standard may be reduced to require preservation of at least eighty-five (85) percent of such acreage and may condition such adjustment in the standard on location of the structure where it allows substantially greater compliance with other standards in this Land Use Code. Adjustment of this standard shall be at the discretion of the County, not the applicant.