A LOW TIME PLT FLIES LOW AND DISTURBS RESIDENTS.

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I WAS FLYING A PAX FOR THE PURPOSE OF REAL ESTATE PHOTOGRAPHY. DURATION OF FLT WAS .6 HRS INCLUDING GND TIME. AREA OF INTEREST WAS S END OF AN ISLAND LOCATED APPROX 3-4 MI FROM THE TWR. PRIOR TO TKOF; I RECEIVED CLRNC FROM THE TWR FOR SEVERAL 360 DEG TURNS AT 800 FT MSL (500 FT AGL) OVER THE AREA OF INTEREST. AT ALL TIMES DURING THE TURNS I WAS IN VOICE CONTACT WITH THE TWR AND THE TWR HAD ME IN VISUAL CONTACT AS I WAS OPERATING CLOSE TO THE PATTERN. ON RETURN TO MY FBO I WAS INSTRUCTED TO CONTACT THE TWR. TWR INFORMED ME THAT A COMPLAINT HAD BEEN FILED WITH FSDO REGARDING MY FLT ALT. I CONTACTED FSDO IMMEDIATELY AND WAS INFORMED THAT THEY HAD 2 COMPLAINTS REGARDING MY MANEUVERS. I TOLD FSDO THAT I WAS CLRED FOR THE MANEUVERS BY THE TWR AND THAT AT NO TIME WAS I FLYING BELOW 500 FT AGL. FSDO TOLD ME THEY WOULD CONTACT THE COMPLAINANTS AND EXPLAIN WHAT WAS GOING ON; OFFER MY APOLOGIES FOR THE DISRUPTION AND LET THEM KNOW IT WAS A 1-TIME OCCURRENCE. I WAS TOLD THAT IF I DIDN'T HEAR ANYTHING ELSE; NOT TO BE CONCERNED.