Owner 500 East Bay Street LLC Choate Construction Co’s plans for the 18-story shell structure did not materialize and the structure continued to stand incomplete.  Prencke, treasurer of The Plaza Condominium Association at Berkman Plaza Inc., watched and waited March 6 with about 75 of his neighbors, city officials and reporters as implosion crews sounded a horn to bring down the 15-year-old high-rise on the Northbank.    Read the entire article……………………………….