Group Certification and Showers

Hi, our project is based on three buildings (A, B and C), with a common basement, dedicated to circulation and parking. We pursue a group certification. Showers and changing rooms are located in the basement and shared for the three buildings (showers and changing rooms are located in two adjacent spaces -one for males and one for females-, close to the stairwell of building A, with free access form circulation area. Questions: 1. Assuming that the distance between Shower & changing rooms and each building's main entrance is less then 200yr, is this solution compliant with the requirement? 2. For WEp1 calculation, in which we have to submit 3 separate forms, one for each building under certification, may we charge the whole number of FTE (related to building s A, B and C) on building A, in order to calculate shower water use? Thank you.