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Create one continuous 15-second video, aspect ratio 9:16, showing a steel office frame at night against an anonymous city skyline. Convey confident upward momentum without spectacle. [00-05s] Begin from a protected service platform and pedestal slowly upward with a 28mm architectural lens feel, keeping columns straight. A welder works on a secured beam connection behind protective screens. Cool task lights outline bolt heads and slightly weathered steel; controlled amber sparks fall into a fire-resistant collection blanket. [05-10s] Continue rising smoothly along the frame with the same lens feel. Reveal a separate erection bay where a crane inches a beam toward position. Workers stay on guarded platforms, outside the suspended load path, guiding alignment with taglines. Lighting remains practical, with distant window glow behind the structure. [10-15s] Finish the upward move beneath the next structural level as the beam steadies near its connection, without implying instant installation. Elevated workers wear correctly anchored fall protection, hard hats, gloves, high-visibility clothing, and safety boots; the welder uses a lowered helmet and full flame-resistant PPE. Sound design: distant traffic wash, low hoist whine, faint wind through steel, and intermittent welding sizzle.