Non-certifiable Parking Garage within LEED Boundary

We are seeking LEED certification for a new office building. A new separate parking garage building (under the same construction contract) falls within the LEED Boundary. I understand that the parking garage will not be certifiable as it does not meet the MPRs for occupancy. Please confirm. We would be applying the white roof of the parking garage to the SSc7.1 credit for Heat Island Effect Non Roof. As such, please advise if we should separate out the material costs for the two buildings for the MR and IEQ credits as one is certifiable and the other not but will contribute to the SSc7.1 credit. There is one previous thread in the MR forum that mentioned this, and the comment was that the material costs of both buildings should be lumped together. If however we do not include the parking garage into the SSc7.1 credit, can we exclude the material costs of the parking garage as it would be "non-certifiable"? Thanks!