High-rises have been popping up like mushrooms in the past year, but instead of being downtown, most of them are in the suburbs, where it seems that every community is creating its own skyscraper park -- just about all of which have been soaring successes. The first and foremost of these many decentralized central business districts is the Denver Tech Center and its adjacent developments in south Denver, Greenwood Village and Cherry Hills Village, where it has been the tradition to build high-style examples of cutting-edge contemporary architecture. The latest masterpiece to adorn the south corridor is the Hines Tower, a neo-modern sculptural triumph by Pickard Chilton Architects of New Haven, Connecticut. Made of polished metal and tinted glass that has been as carefully detailed as a piece of jewelry, the thirteen-story building was assembled in a complicated group of volumes and shapes that have been clustered and stacked. The shiny metal framework grid that envelops the curtain walls makes the building appear taller, because the position of the interior's floors cannot be seen from the outside, as is typically done. Even among its handsome neighbors in and around the DTC, many of them visible from I-25, the sharp-looking Hines tower stands out.