"When a project has replaced some of the core fixtures, they have essentially brought those fixtures into their LEED-CI project scope of work."

A project in which fixtures are replaced in the core area (landlord) - does the landlord spaces now fall into the LEED boundary and other credit categories then apply? There will be no other work carried out in these areas under the scope of work - the only reason is to change out the fittings to achieve water credits.