You will be given a definition of a task first, then some input of the task.
In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

Passage: The Monadnock was commissioned by Boston real estate developers Peter and Shepherd Brooks in the building boom following the Depression of 1873–79. The Brooks family, which had amassed a fortune in the shipping insurance business and had been investing in Chicago real estate since 1863, had retained Chicago property manager Owen F. Aldis to manage the construction of the seven-story Grannis Block on Dearborn Street in 1880. It was Aldis, one of two men Louis Sullivan credited with being "responsible for the modern office building", who convinced investors such as the Brooks brothers to build new skyscrapers in Chicago. By the end of the century, Aldis would create over 1,000,000 square feet (93,000 m2) of new office space and manage nearly one fifth of the office space in the Loop.Daniel Burnham and John Wellborn Root met as young draftsmen in the Chicago firm of Carter, Drake, and Wight in 1872 and left to form Burnham & Root the following year. At Aldis's urging, the Brooks brothers had retained the then-fledgling firm to design the Grannis Block, which was their first major commission. Burnham and Root would become the architects of choice for the Brooks family, for whom they would complete the first high-rise building in Chicago, the 10-story Montauk Building, in 1883, and the 11-story Rookery Building in 1888.
Output:
What are the first names of the people who had retained a then-fledgling firm to design their first major commission?