PLT OF AN SMA SEL ACFT OPERATED THE ACFT BELOW THE MINIMUM REQUIRED ALT DURING PHOTOGRAPHING HIS COMPANY'S FACILITY.

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I TOOK A FRIEND (WITH A CAMERA) UP IN AN SMA SEL AND WE FLEW 500 FT AGL TO THE COMPANY WE WORK AT WHICH IS S OF DAVIS; CA. WE MADE 3 PASSES OVER THE COMPANY BUILDING AT 300 FT AGL FOR PHOTOS. EVERYONE AT THE COMPANY KNEW AHEAD OF TIME THAT WE WERE GOING TO FLY OVER AND WERE ACTUALLY ON THE ROOF WAVING. THE COMPANY OWNS THE LAND (WHICH IS OPEN FIELD 0.2 MI IN LENGTH) OVER WHICH WE FLEW BELOW 500 FT. THERE IS ALSO A 1/4 MI OPEN FIELD NEXT TO THE BUILDING TO THE W TO GIVE A TOTAL OF 0.5 MI OF OPEN FIELD (AND NO OTHER BUILDING OR PEOPLE). WE DID NOT FLY OVER ANY OTHER BUILDINGS OR PEOPLE (OTHER THAN THE COMPANY) AT A FLT ALT OF 500 FT AGL. HOWEVER; WHEN I LANDED AT UNIVERSITY ARPT; AN INSTRUCTOR SAID SOMEONE CALLED AND NOTICED A PLANE FLYING AT ABOUT 300-500 FT AGL. TO MY KNOWLEDGE; NO COMPLAINT HAS BEEN FILED. I KNOW I USED POOR JUDGEMENT FLYING AT THIS LEVEL. I AM CERTAIN THIS EVENT WILL NEVER HAPPEN AGAIN. I WILL NEVER FLY LOW AGAIN -- UNLESS LNDG AT ARPTS. I FEEL AWFUL THAT THIS COULD GIVE UNIVERSITY ARPT A BAD NAME. I HAVE NO OTHER VIOLATIONS. I HAVE BEEN FLYING 16-17 YRS WITH NO INCIDENTS/CITATIONS -- NOT EVEN A TFC TICKET! I AM GRAVELY SORRY.