Can a Retail CI 2009 (restaurant) project achieve Water use reduction credit, if there is no Rest room in the (Retail CI) project scope. The (Retail CI) tenant space is within a LEED certified base building which has the rest room for all its occupants/ visitors.

How to calculate the water requirement for the Water closets/urinals when the Rest rooms are under the base builder scope and not under the (Retail CI) tenant scope.

Thank You!..