The LEED User Guide clearly states in Equation 2. Vegetated space >= 25% x Required Open Space, that the calculation uses required open space as against the proposed design available open space.
But it seems like the Credit form calculation of 'Percentage of open space that is vegetated (%)' looks at the 'Area of open space (sqft)' which is used to show compliance with the open space (%), and hence cannot be documented as 30% of total site area. Outlined below are the numbers crunched for the project and as input in the Credit form -
Total site area, including building footprint(s) (sq ft) - 45,774 sq.ft (Value input by team)
Area of open space (sq ft) - 15,119 sq.ft
Percentage of site area that is open space (%) - 33.03 (Autocalculated using values above)
Area of open space that is vegetated (sq ft) - 3,577 sq.ft (Value input by team)
The Credit form incorrectly refers to the Area of actual design/project open space area and not the 'Required Open Space' area.
Percentage of open space that is vegetated (%) - 23.66 (Autocalculated using 'Area of Open Space' and 'Area of Open Space that is vegetated')
Percentage of open space that is vegetated (%) - 26.04 (WHEN Calculated using 'Required Open Space' and 'Area of Open Space that is vegetated')
We submitted with the %of vegetated open space calculations at 23.66% and pointing out the discrepancy in calculation method in the 'Special Circumstances' section, but still were denied the credit in the first review noting that we didn't meet the min. 25% threshold.
Please advice on what other documentation should be provided to convince the reviewers about the discrepancy in the Credit Form.