Challenges faced in Greening Existing Buildings.

Akshat, that's a very big question that requires detailed information on your specific project to answer. This website and the guidance on LEED--EBOM will talk you through it a step at a time. I recommend reviewing the EBOM credits and prerequisites, one at a time. Pay special attention to the "Readiness Review Questions" posted on all of our EBOM pages like this: https://leeduser.buildinggreen.com/credit/EBOM-v4/SSp1 You might also consider working with an experienced LEED consultant if the entire project team is new to LEED.