Market Watch reports that Sun Communities, Inc. (NYSE:SUI) will release its second quarter 2011 earnings report prior to the opening of the market on July 28, 2011.  A conference call to discuss the earnings report will be held that same day at 11:00 AM.  Sun Communities is a real estate investment trust (REIT) that owns and operates 155 manufactured housing and recreational vehicle communities comprising 53,500 sites.