We are working on a project, renovation of an existing 3 story building in an urban area. The entire interior will be renovated and finished including 6,000 sf of office area, lowering of the basement slab, replacing HVAC system, modifying existing electrical and plumbing. Exterior modifications will be limited to roof and leak repairs. I'm not sure if this would be considered major renovation/ new construction or if we can use commercial interiors. Can you help me determine which rating system is most appropriate?