Since 2003, the city has been experiencing a historic building boom. Development hasn't been this high for 30 years. Construction workers pouring concrete inside wall - less high rises, cranes hovering over head and the site of buildings slowly rising are common these days. But that prosperity has come at an enormous cost of life. So far this year, 27 construction workers have died working on private and public jobs in New York City, even as the city and the federal government try to find new ways to improve safety. In the The Cost of Doing Business, WNYC looks at one accident and analyzes why people are still dying. Earlier this year, in Brooklyn, a man, an immigrant worker from Mexico, fell to his death. This is part one of how and why he died.