Eidlitz began working for his father. His first independent work was the 1877-78 reconstruction of St. Peter's Church in the Bronx after it was damaged by fire. It had originally been designed by his father. His early Gothic and Romanesque Revival designs, including Dearborn Station in Chicago, Michigan Central Station in Kalamazoo, and the precursor to the current Buffalo & Erie County Public Library in Lafayette Square, show his father's influence. His Romanesque Revival design for the Metropolitan Telephone Building on Cortlandt Street was the first purpose-built telephone building in New York City. Another Romanesque design was selected for The Bank for Savings in the City of New-York which was erected in 1894. By the turn of the century, Eidlitz embraced the Beaux-Arts style. In 1903, he formed Eidlitz & McKenzie with Andrew McKenzie, who had been a construction supervisor and engineer for his father's firm. Eidlitz & McKenzie was one of the first architecture firms that put architects and engineers on equal footing. Eidlitz & McKenzie worked primarily on telephone buildings, but their best known design was for the New York Times Building for the publisher Adolph Ochs. Their design used their expertise in connecting buildings to subterranean infrastructure. The building, the second-tallest in the city at the time, incorporated a subway stop into its basement levels. Times Square was named for the building. Eidlitz's other works include the Association of the Bar of the City of New York, located at 42 West 44th Street in Manhattan, New York City. It is still occupied by its original client, unlike many other old New York City buildings. He also designed, with others, the Bell Laboratories Building, a National Historic Landmark in New York City, as well as the First National Bank on West Commerce Wtreet. The interior decoration design of the Arnot Memorial Chapel at Trinity Church in Elmira, New York is also attributed to him.
Marriage and family
Eidlitz married Jennie Turner Dudley, who was the daughter of Joseph Dana Dudley and Caroline Felthousen of Buffalo, New York. They had two daughters who were both born in New York City: Caroline Dudley Eidlitz, who married Alexander Ladd Ward on December 14, 1904; and Marion Dudley Eidlitz, who married John Butler Jameson on November 19, 1913. Cyrus Lazelle Warner Eidlitz died in New York City on October 5, 1921.