SA226 METROLINER PLT STRIKES A BUILDING WITH THE WINGTIP TAXIING OUT OR DEP AT MMCS.

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PRIOR TO DEPARTING MMCS (JUAREZ; MEXICO) WE ACCOMPLISHED THE PREFLT; AND CALLED TWR FOR CLRNC. WE WERE TOLD TO ASK FOR THE CLRNC WHEN ASKING TO TAXI. WE PROCEEDED WITH THE BEFORE START CHKLIST. THE CONDITIONS WERE DARK; RAINY AND A WET SURFACE. OUR PARKING PROX WAS FACING AN FBO. THE BUILDING IS APPROX 15 FT HIGH. THERE IS A SPOTLIGHT ILLUMINATING THE RAMP WHICH WAS DIRECTLY IN FRONT OF THE ACFT. THE MARSHALLER MOTIONED US FORWARD; AND THEN A TURN L. I BEGAN A L TURN AND REACHED FOR THE PARK BUTTON TO EXPAND THE NOSEWHEEL STEERING FROM 10 DEGS TO 63 DEGS. IN DOING SO; I HIT THE NOSEWHEEL ARM SWITCH (BESIDE THE PARK BUTTON) INTO THE OFF POS. THE PANEL LIGHT WAS OUT; AND THE EXTERIOR SPOTLIGHT MADE IT DIFFICULT TO SEE THE PANEL CLRLY. THE FO WAS OBTAINING CLRNC AND COULD NOT ASSIST IN OUR DISTANCE FROM THE WALL ON OUR R. I BEGAN TO BRAKE THE ACFT WITHOUT SUCCESS. THE BRAKES HAVE BEEN WRITTEN UP SEVERAL TIMES IN THE PAST 3 MONTHS AS WORKING SPORADICALLY. I FELT PRESSURE; BUT LITTLE BRAKING ACTION; AND OUR R WINGTIP STRUCK THE WALL. WE SHUT DOWN THE ACFT AND INSPECTED THE DAMAGE. THE WINGTIP; A PLASTIC 1-PIECE CONSTRUCTION HAD BEEN DAMAGED. THE FO; ALSO AN A&P MECH WITH THE COMPANY VISUALLY INSPECTED AND FOUND LITTLE DAMAGE. PRIOR TO THIS FLT; I HAD RECEIVED A TELEPHONE CALL FROM MY TRAINING CAPT WITH REGARD TO SEVERAL LATE DELIVERIES AND UNHAPPY CUSTOMERS. IN ADDITION; CELL PHONE COVERAGE IS LIMITED IN MEXICO; AND I FELT IT WAS BEST TO PROCEED WITH THE 6 MIN FLT TO EL PASO AND ADDRESS THE PROB THERE. THE RETURN FLT TO EL PASO WAS UNEVENTFUL; AFTER CHKING THE STEERING AND BRAKING OF THE ACFT. WE CLRED CUSTOMS AND I NOTIFIED THE COMPANY DIRECTOR OF MAINT; DIRECTOR OF OPS; AND TRAINING CAPT OF WHAT HAD OCCURRED. THE AIRPLANE WAS WRITTEN UP; AND WE SWITCHED TO ANOTHER ACFT TO CONTINUE THE FLT. I FELT PRESSURED TO COMPLETE THE SHORT FLT; AS WELL AS HAVING AN A&P MECH INSPECT THE DAMAGE AND ASSESS IT AS OK FOR FLT. IN DOING SO; I FAILED TO COMPLETE THE PAPERWORK CORRECTLY; AND WE SUBSEQUENTLY ARE NOW BEING INVESTIGATED BY THE FAA. MY ACTIONS SHOULD HAVE BEEN TO DISCONTINUE THE FLT; AND AWAIT FURTHER INSTRUCTIONS. HOWEVER; IN VIEW OF THE LITTLE DAMAGE AND SHORT FLT; PLUS THE PRESSURE TO COMPLETE THE FLT WITHOUT ANY FURTHER DELAY; I DECIDED TO CONTINUE; WHICH IS IN BREACH OF FARS.