Mayor Bloomberg chatted with Downtown real estate executive Richard Feldman Tuesday night at a party to celebrate the ten-year anniversary of the opening of the Information Technology Center at 55 Broad St. The Rudin Management building had been vacant with the collapse of the Drexel Burnham junk bonk firm, and the Rudins made major technological investments in the building to attract high-tech firms and extend New York’s Silicon Alley into the Financial District. Bill Rudin, president of Rudin Management, recalled a meeting on the ground floor a decade ago with several executives including a billionaire businessman named Michael Bloomberg who also knew something about high-tech firms.