When did the construction of the Flatiron Building start?

Detailed answer

The construction of the Flatiron Building began in 1901, with a groundbreaking ceremony marking the start of the project. The building was designed by architect Daniel Burnham and his firm, and it was intended to be a flagship building for the Fuller Company, a prominent real estate developer at the time. The construction process took approximately two years to complete, with the building officially opening on October 27, 1902.