Henry Adams completes Baltimore’s iconic Emerson Bromo-Seltzer Tower in 1910. At 289 feet, it becomes the tallest building in Baltimore and holds the title for over a decade. Years later it is added to the National Register of Historic Places.

Henry Adams completes a number of projects including the 17-story Emerson Hotel in 1911. The most notable project is the 18-story Hearst Tower in 1912, which houses the Maryland Casualty Company until it is purchased by William Randolph Hearst for his newspaper empire. The firm also completes the Southern Hotel in 1917.

In the 1910s, local ordinances begin limiting what can be built. The 61st US Congress enacts the Heights of Buildings Act in to limit heights of buildings in DC to the width of their right-of-way on the street they front. New York City adopts the first zoning regulations.