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| A memorial to Trayvon Martin, 17, is attached to a street sign outside the Retreat at Twin Lakes in Sanford.
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George Zimmerman, 28, moved into the Retreat in the summer of 2009 with  his wife, Shellie. Records show he worked at a pressure-washing  company, though neighbors said they never saw a truck.
Right away, he started calling the police. The 911 operators translated  his complaints into the bloodless shorthand of law enforcement.
Aug. 26, 2009: "Male driving with no headlights on."
Sept. 22, 2009: "Yellow speed bike doing wheelies."
Oct. 23, 2009: "Aggressive white and brown pit bull."  
 The transcripts of Zimmerman's 911 calls during the more than two years  he lived on Retreat View Circle fill 28 pages. His concerns include  everything from the driver of a pickup cutting off people to a neighbor  leaving his garage door open.  
He kept a close watch for outsiders, but it couldn't have been easy to  tell who belonged and who didn't. When the housing market crashed, many  townhomes were foreclosed on and the owners evicted. Dozens of  investors, unable to unload the two- and three-bedroom properties,  rented them to cover their upside-down mortgages.  
The developers had envisioned a stable neighborhood with homeowners  planting long-term roots, but now townhouses were turning over all the  time. Insiders moved out. Outsiders moved in.  
By the time Zimmerman shot Trayvon Martin, 40 properties inside the  gate were empty and more than half of the residents were renters.   
Including Brandy Green, who was dating Martin's dad. And Zimmerman himself.  
Trayvon Martin lived with his dad, who resides in the Miami area, and  had visited his dad's girlfriend at the Retreat several times before.  The kids in the neighborhood always looked forward to playing football  with him. But to George Zimmerman, he was a stranger.  
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