In 1891, Boyce began working on his own 12-story office building at 30 North Dearborn Street, known as the "Boyce Building", it was designed by architect Henry Ives Cobb. Even 20 years later, this building was recognized as the most expensive building (in terms of dollars per cubic foot) in Chicago. In 1907, Boyce consolidated his business operations into another office building, also known as the Boyce Building, at 500–510 North Dearborn Street. A new four-story office building—designed by the architectural firm of Daniel Burnham—was built on this location in 1912 and expanded during 1913–14 with an additional six stories. This building was later listed on the National Register of Historic Places on February 29, 1996, maintained by the United States Department of the Interior and its National Park Service.