B737-700 STRIKES TERMINAL BUILDING WITH L WINGTIP DURING MARSHALED DEP FROM GATE AT GST.

Narrative

UPON TAXI OUT; L WINGTIP IMPACTED PART OF THE TERMINAL. TAXIED BACK IN AND SHUT DOWN ENGS. WE ARRIVED IN GST AFTER FLYING VOR DME RWY 29. WE PERFORMED SHUTDOWN DUTIES; I DID WALKAROUND FOR CO-PLT SINCE HE WAS BUSY PREPARING COMPUTER AND AIRPLANE FOR HIS LEG BACK TO JNU. WE WERE PARKED EXACTLY ON THE DESIGNATED PARKING SPOT. I RETURNED TO FLT DECK TO HELP THE FO SINCE THIS WAS HIS FIRST TIME INTO GST. WE DISCUSSED HOW CLOSE THE AIRPLANE WAS TO THE BUILDING; WHY THERE WAS NO TUG AND WHY THE AIRPLANE SPOT AND TAXI LINES ANGLE IN TOWARDS THE BUILDING. WHEN WE WERE READY TO TAXI; I SIGNALED THE MARSHALER (IN FRONT OF NOSE). SHE WAVED ME ON TOWARDS THE RWY AND MOVED OVER NEXT TO BUILDING. DID NOT SEE ANY WING WALKERS. I ADDED PWR. ONCE THE ACFT STARTED MOVING FORWARD; I SIMULTANEOUSLY CLOSED THE THROTTLES AND TURNED THE NOSEWHEEL AWAY FROM THE BUILDING TOWARD THE RWY. AS WE TAXIED FORWARD; I FELT SOMETHING. I THOUGHT I RAN OVER A CHOCK LEFT ON THE RAMP. I STOPPED THE AIRPLANE AND CALLED OPS (AS THEY WERE CALLING ME ALONG WITH THE FLT ATTENDANTS). THEY TOLD ME WE HIT THE BUILDING. I INFORMED PAX THAT WE WERE RETURNING TO PARKING. WE MADE R TURN ONTO TAXI LINES AND FOLLOWED MARSHALER'S INSTRUCTIONS BACK TO PARKING SPOT. I STEPPED OFF AIRPLANE AND SAW THE DAMAGE AT L WINGTIP. RAMP WAS WET.