Against a phalanx of mostly dreary new apartment towers, the soon-to-open Hunters Point Community Library by Steven Holl Architects is a diva parading along the East River in Queens, south of the famous Pepsi sign. With its sculptured geometry — a playful advertisement for itself — it’s even a little like the Pepsi sign.

Compact, at 22,000 square feet and 82 feet high , the library is among the finest and most uplifting public buildings New York has produced so far this century.

It also cost something north of $40 million and took forever to complete. So it raises the question: Why can’t New York build more things like this, faster and cheaper?

Opening Sept. 24, Hunters Point is surely what Queens Library officials and the borough’s former president, Helen M. Marshall, had in mind when the project was proposed more than 15 years ago: a crown jewel among Queens branches, at a singular, symbolic spot facing the United Nations and Louis Kahn’s exalted Four Freedoms Park across the water.