Garage below grade

Hi All, I'm now working on a project under LEED certification which aims to pursue this credit. This project has an external parking area (which is included in the LEED Boundary) above grade and external to the building and a naturally ventilated garage, located exactly below the parking area (same extension, 1 level below grade). The natural ventilation is provided by grids (according to the national fire regulation). The garage below grade is connected to the building through a corridor. The corridor is separated from the garage by means a vestibule, with deck-to-deck partition and double self closing doors. May we assume to comply with the credit by creating an overpressure in the vestibule instead of the suggested negative pressure obtained by a strong exhaust from the garage area? Thanks