Concurrently with the land acquisitions, Flagg was retained to design a second addition to the Singer Building in 1902. By early the next year, he was planning a building that would be the tallest in the world, with over 35 stories. However, the Singer Manufacturing Company did not reveal specific details until February 1906, when it announced that it would build a tower, the world's tallest. Revised plans were filed in July 1906, which provided for a more wind-resistant structure. The company intended to occupy the space above the 31st floor and planned to rent out the bottom section of the tower to tenants to subsidize their use of the upper floors. The Singer Company projected that it would earn $250,000 in rent per year, given a baseline rental cost of . Numerous engineers were hired to create the construction plans as soon as the architect's plans and specifications were published.