 In 1860 a consortium of no fewer than six engineers—including Brown, Hollingsworth and George Pullman—co-managed a project to raise half a city block on Lake Street, between Clark Street and LaSalle Street complete and in one go.This was a solid masonry row of shops, offices, printeries, etc., long, comprising brick and stone buildings, some four stories high, some five, having a footprint taking up almost of space, and an estimated all in weight including hanging sidewalks of thirty-five thousand tons.Businesses operating in these premises were not closed down during the operation; as the buildings were being raised, people came, went, shopped and worked in them as they would ordinarily do.