A pair of landmarks provides a striking backdrop for motorists traveling south across the Michigan Avenue Bridge, circa 1930. On the right, the Stone Container Building (formerly the London Guarantee and Accident Building) boasts an ornamental tower—a feature made possible by changes in the building code in 1920. Its counterpart on the left, 333 N. Michigan Avenue, has a tower designed to be within the limits of the city's 1923 zoning ordinance. The main part of each building rises to nearly the maximum height allowed by the city at the time. (Chicago Historical Society)