Those rules allow companies to have signs as large as 1,100 square feet, depending on how high up on a tower they are placed. To be eligible, a company must occupy at least 350,000 square feet or 51% of the total space in a building, and the firm must employ more than 1,000 people there.
Sign of the times? As downtown tries to come back, Chicago will allow a few buildings a second high-rise sign.
