Du Pont forced Andrews from the project, apparently upon Horowitz's advice, and Andrews sued du Pont in July 1913, leading du Pont to pay Andrews $100,000 for his involvement. Horowitz then corresponded with Ernest Graham, the other major partner at D. H. Burnham & Company after Burnham's June 1912 death, who would become the architect of the new tower. Graham designed the structure as a bulky mass, wanting to maximize the amount of office space on the site rather than a corporate symbol. Graham's key concern was with the height of the elevators, and he discussed the issue with preeminent elevator engineer Charles E. Knox, who said that "the elevator service will determine the height of the building". This differed from Graham's previous commissions, where elevators were considered after the height of the building was specified. Knox ultimately recommended against building a 42-story structure, but recommended a 36-story edifice since that height could meet the client's safety and speed criteria.