HOT AIR BALLOON GRAZED A HANGAR DURING LNDG. THE HANGAR WAS DAMAGED. RPTR SUSPECTS A DOWNDRAFT FROM 10 KT WIND OVER THE HANGAR CAUSED HIS UNPLANNED STEEP DSCNT.

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DURING FLT; THE WIND PICKED UP AND WHEN I ASKED THE TWR WHAT THE SURFACE WIND WAS; THEY RPTED 10 KTS FROM THE NNW. SINCE IN MY EXPERIENCE THE WINDS SELDOM DIE DOWN AS THE MORNING PROGRESSES; I ANNOUNCED TO THE TWR THAT; BECAUSE OF SAFETY CONCERNS; I WAS GOING TO PUT THE ACFT DOWN. I WAS AT THE FAR EASTERN EDGE OF THE ARPT TO THE E OF THE CTL TWR. MY LAST CHANCE TO LAND AT THE ARPT WAS ON A GRASSY AREA TO THE E OF RWY 32. MY GLIDE PATH WAS NECESSARILY QUITE SHALLOW AND CROSSED OVER A SHEET METAL HANGAR. THE BUILDING APPARENTLY CAUSED A DISTURBANCE IN THE WIND FLOW OVER THE BUILDING WHICH CAUSED A DOWNDRAFT ENOUGH TO HAVE THE BOTTOM OF THE BASKET TOUCH THE METAL ROOF OF THE HANGAR. THE IMPACT CAUSED VERY SLIGHT DAMAGE IN THE FORM OF 2 SHALLOW DENTS CAUSED BY THE SKIDS OF THE BALLOON AND A 3 OR 4 INCH LONG SEPARATION OF THE JOINT BTWN 2 ADJACENT SHEET METAL PANELS. EVEN THOUGH IT WAS A HIGH WIND; DOGHOUSE LNDG; THERE WERE NO INJURIES TO EITHER 2 PAX OR THE PLT AND THERE WAS NO DAMAGE TO THE ACFT.