I'm designing a [BUILDING TYPE] that is [HEIGHT/STORIES] with [SPAN REQUIREMENTS]. Help me evaluate structural system options: 1) Compare steel frame, concrete frame, CLT, masonry bearing wall, and hybrid systems for this project, 2) For each: cost range ($/SF), construction timeline, span capabilities, design flexibility, 3) What the structural system choice implies for my architecture (floor depths, column spacing, floor-to-floor heights), 4) Questions I should be asking my structural engineer at the SD phase. My aesthetic goals: [DESCRIBE].