Thanks, Tristan, for redirecting me here!
We are completing a LEED NC for a major renovation for a building on a campus. Adjacent to this building, connected to it and another building on the other side is a public entry / security / gathering space type of lobby. The owner would like to pursue LEED CI for that space - anyone with experience with that?

Looking through the guidance it looks to me like it is OK since it is a definable separate space - the lobby, versus a part of a tenant space or office suite - but it is not separate by lease or ownership. I would guess that there is fire separation but whether that counts as a "party wall" i am not sure. Mechanical systems are partly unique to this lobby space, partly shared across the buildings, but very little mechancally is in our scope.

On this campus projects are identified with letters or numbers, so this would be called "Building X Lobby"