Questions 1–5 are based on the same project scenario.

Questions 1–5 are based on the same project scenario. Please use the scenario information when answering.

A hospital certified under LEED V5 in 2018 is designing and constructing a 21,000 ft² (1,950.96 m²) vertical addition, plus vegetated terraces and a mechanical penthouse.

The original hospital achieved the Gold certification level and was built with the capacity to add three floors—levels six through eight—to the top of the structure. This addition requires partial demolition of the roof and the floor below.

The project is designed to be architecturally cohesive with the existing building façade and is targeting Platinum certification under LEED v5.

The campus is in a dense urban area adjacent to several bus stops, a light-rail transit station within a 2,500 ft. (762 m) walking distance, and a bicycle docking point at the main entrance to the property. An on-campus shuttle service connects patients, visitors, and staff from the parking areas to each medical building and the light-rail station.

The healthcare campus has existing infrastructure; therefore, no new roads, sidewalks, parking structures, or ground-level landscaping will be installed.

The new floors have separate mechanical systems in the penthouse, but piping for public and patient restrooms, janitor closets, and staff break rooms connects directly to the main hospital plumbing system.

The newly installed medical equipment uses gas, steam, and chilled water supplied by the campus central plant.

Based on the project design and the credit options that the project team may attempt, what is the highest LEED certification level that can be achieved?