Which existing site elements are most important to locate in preparing a schematic design phase...

Comprehensive and Detailed Explanation From Exact Extract:

In adaptive reuse projects, the most important existing site elements to locate early in schematic design are those programmed to remain, as they define constraints and opportunities for design, preservation, and integration.

Structures to be removed (A) are important but secondary as they will not impact final design.

Utilities and services (B) are critical but often identified after understanding existing building layout.

Focusing on elements to remain ensures the design respects existing conditions and capitalizes on retained assets.