>10% exemption possible?

Hello, Has anyone heard of possibility to exclude >10% of building gross area that is under separate ownership and management? In our case such space makes 14%. Although the space is on the ground floor, but is located within the building and cannot be vertically of horizontally separated. It is a state institution that refuses to participate in LEED project due to security issues. However it does use seperate HVAC systems and has separate energy and water meters, as well as separate access points to their premises. Would that make it possible to exclude this space from LEED cert. scope, based on the LEED EBOM exemption rule for multitenanted buildings? Thanks for sharing your ideas!