Balancing heritage preservation with energy standards in adaptive reuse

[Mia52]

I'm an architect working on a project that involves adapting a historic industrial building for modern use, and we're facing a conflict between preserving the original structural fabric and meeting current energy efficiency and accessibility codes. The client wants a sustainable certification, but some of the required upgrades would compromise significant historic features. For professionals in adaptive reuse, how have you navigated these regulatory and design conflicts, and what innovative solutions have you found to improve performance while respecting the building's heritage value?