We are working on a remodel project encompassing three distinct areas within one portion of a hospital and I am not confident with my understanding of the definitions of Project Boundary vs. Site Boundary vs. Building.

The hospital is comprised of a number of attached buildings on one city block and another block across a public street with the hospital's parking structure and support facilities. Based on the MPRs and Supplemental Guidance I understand the LEED Project Boundary as circumscribing the areas being affected by our project. It would also seem that the Site Boundary can include both blocks (allowing us to use the parking structure for Site Selection Path 4). Is this correct?

I am not clear on the definition of "Building". Would this just be the portion of the complex that houses the remodel areas? Would it be the entire aggregate of attached structures?