Hotel Knickerbocker, 1913. Not to be outdone by his cousin and occasional real estate rival William Waldorf, who had funded the Hotel Astor, John Jacob Astor IV built the Hotel Knickerbocker just a few blocks away. The Knickerbocker, like the Astor, was a Beaux-Arts building. Designed by Marvin & Davis, the 1906 hotel had a prominent mansard roof and light colored terra cotta decoration on its red brick facade. The hotel had 556 rooms, a 2000 seat theatre, and a Maxfield Parrish mural "Old King Cole" in its bars. (That mural has been installed in the St. Regis Hotel bar since 1935.) Supposedly the martini was invented in the bar at the Knickerbocker, though evidence proves otherwise. Astor would die in the sinking of the Titanic in 1912 and the hotel was closed and converted into offices in 1920 under financial strain by Astor's son. In the next nearly 100 years the building functioned as offices, residences, showrooms and studios for garment companies, and finally as of 2015, a hotel once again.

In the closing decades of the 19th century, New York underwent a profound physical and cultural transformation. Fueled by the wealth of the exploding financial and manufacturing sectors, the city rapidly evolved into a world-class metropolis. The bold ambitions of civic and business leaders, architects, and engineers of the era manifested in landmarks such as the vast Cathedral of St. John the Divine, the stately U.S. Custom House, the towering Municipal Building, and the original terminus of New York City’s first official subway line—the ornate City Hall stop. The sweeping interior spaces common to all of these structures, and hundreds of others, depended upon a venerable Mediterranean building technology adapted to contemporary American construction: arched tile ceilings—or vaults—that were not only self-supporting but could also bear the weight of floors or roofs above them. These vaults were designed and built by a single New York firm, founded by Spanish immigrant Rafael Guastavino (1842-1908) and later headed by his son Rafael Jr. (1872-1950). The Guastavinos’ patented system for building domes and vaults involved multiple layers of thin ceramic tiles bonded with quick-drying mortar. The resulting structures were not only exceptionally strong, but also lightweight, easy to build, and inherently beautiful, thanks to intricate patterns of exposed tile that formed finished, decorative surfaces. Guastavino vaults figured prominently in more than 1,000 projects across the nation, including 200 in Manhattan alone. During its 73-year history, the Guastavino Company helped build some of the most impressive interior spaces in America—veritable palaces for the people. This list based on MCNY's exhibition Palaces for the People, contains many of Guastavino's masterpieces in the five boroughs, both those that remain and those that have been lost to the wrecking ball.

Knickerbocker Hotel ARCHITECT: Marvin & Davis; Bruce Price DATE: 1901-06 STYLE: Beaux-Arts, French Renaissance The Knickerbocker Hotel is one of the very few grand hotels in the Beaux-Arts style surviving in the Times Square area. The building was financed by John Jacob Astor, the fourth namesake of the patriarch of one of America’s richest families. It is executed in red brick, richly ornamented with French Renaissance detail, and crowned by a prominent copper mansard roof with corner pavilions and cresting.