Five sculptures that were stored for years in a public works warehouse are being put back on pedestals four years after one artist’s persistent queries led to their discovery.

Thursday morning, a crew from Mangery & Sons hoisted Peter Calaboyias’ stainless steel sculpture “Five Factors” into place on a concrete slab behind the baseball field in Mellon Park, Shadyside.

Standing beside one of the six-sided skewed cylinders, he beamed and said seeing it in public was a thrill “after all these years.”

“Five Factors” was one of four sculptures chosen in a 1971 public art competition and placed atop the garage at the Squirrel Hill branch of the Carnegie Library. They were among the first contemporary sculptures to be displayed as public art in the city. At the time, the city required that 1 percent of the construction budget for a public building be spent on art.

Thomas Morandi, Edward Bordas and Jim Myford were the other artists whose works were chosen.

Years ago, the sculptures were removed, either for repair or to accommodate changes in use of space. Mr. Calaboyias thought his sculpture had been stolen and sold for scrap, he said.

Library officials said the works had been sent to a restoration company in the 1990s. But at some time after that, the public works department retrieved the works when the company went bankrupt and stashed them in a warehouse under the 62nd Street Bridge.

They stayed there until 2006, when Councilman William Peduto’s staff learned about the sculpture and contacted Mr. Calaboyias.

The artist, who had raced to the warehouse to make the identification, said it was both distressing and exciting to see them.

“Five Factors” was inspired by ancient Greek stelae, or cylindrical stone markers that were inscribed with words or carvings, he said.

Half of a Richard King Mellon Foundation grant of $300,000 was used to restore and relocate the sculptures. The fifth was the work of Aaronel deRoy Gruber. It was originally on the portico of the City-County Building, then on the site where the David L. Lawrence Convention Center is now. It was stored with the other four.

Morton Brown, public art manager for the city, said the five pieces were in “the most dire need” of conservatorship among the city’s collection. Three went to the McKay Lodge Conservation Lab in Ohio. Mr. Myford and Mr. Calaboyias did their own repairs; in fact, Mr. Calaboyias’ is an exact replica of the original, which “had too many dents to be pounded out to save,” he said.

The Bordas piece has to hang on a wall, said Mr. Brown. Its new location has yet to be decided.

“I’m trying to find a city-owned facility that has an architectural style” that’s the right fit for “two abstract, elongated triangles welded together and painted red. Really quite beautiful. But I haven’t found the right place yet.”

The sculpture is under 200 pounds, he said.

Mr. Myford’s work — two elongated rectangular forms angled like fingers aloft — was installed two months ago in Grandview Park in Mount Washington, just above the historic stone steps off Bailey Avenue.

Mr. Morandi’s and Ms. Gruber’s works will be installed in Mellon Park.

With the rest of the grant, Mr. Brown and the Greater Pittsburgh Arts Council’s Office of Public Art will determine which pieces should next be restored, weighing costs, deterioration, visibility and the prominence of the artist, he said.

“We have 110 pieces in the collection and we have about 21” identified as most in need, he said.

“If we can get five more done next year, then we will leverage money for the others.”