Hi! The project team wants to achieve this credit for an existing office building next to a residential neighbourhood. In the Bird'sEyeView above it says that ambient noise measurements should be taken on the project site prior to construction to establish the current Ldn. How does a team measure it for an existing building? Or should it just take measurements of the existing noise level at the "critical zones" at the boundary with residential neighbourhood and see if results satisfy the noise limits?

Thank you!