In New York City's ambitious building boom c. 1900, Clinton and Russell were responsible for designing the world's largest apartment building, the world's largest office building, and a cluster of early downtown skyscrapers along Broadway and Wall Street for banks and insurance companies. Many of the firm's important commissions related to real estate investments of the Astor family. The landmark Astor Hotel that served as an anchor for the development of Times Square, the Astor Apartments, the Graham Court Apartments, and The Apthorp were among their projects for William Waldorf Astor, 1st Viscount Astor.