860–880 Lake Shore Drive is a twin pair of glass-and-steel apartment towers on N. Lake Shore Drive along Lake Michigan in the Streeterville neighborhood of Chicago, Illinois. Construction began in 1949 and the project was completed in 1951. The towers were added to the National Register of Historic Places on August 28, 1980, and were designated as Chicago Landmarks on June 10, 1996. The 26-floor, 254-ft (82 m) tall towers were designed by the architect Ludwig Mies van der Rohe, and dubbed the "Glass House" apartments. Construction was by the Chicago real estate developer Herbert Greenwald, and the Sumner S. Sollitt Company. The design principles were copied extensively and are now considered characteristic of the modern International Style as well as essential for the development of modern High-tech architecture. The towers were not entirely admired at the time they were built, yet they went on to be the prototype for steel and glass skyscrapers worldwide. Initially, it was difficult to acquire financing for the project, turned down by lenders like Baird & Warner, who considered the design scheme to be too extreme. 860–880 Lake Shore Drive Apartments embody a Modernistic tone with their verticality, grids of steel and glass curtain walls (a hallmark of Mies' skyscrapers), and complete lack of ornamentation. Tenants had to accept the neutral gray curtains that were uniform throughout the buildings; no other curtains or blinds were permitted lest they mar the external appearance. Since Mies was a master of minimalist composition, his principle was "less is more" as it is demonstrated in his self-proclaimed "skin and bones" architecture. The structural engineer for the project was Georgia Louise Harris Brown, who was the first African American to receive an architecture degree from the University of Kansas, and the second African American woman to receive an architecture license in the United States. Controversy This building, like many of his Chicago high-rise structures, caused controversy in the pure minimalist community due to its mullions. Mies is hailed as the father of "less is more"; however, 860–880 Lake Shore Drive is covered in non-functional I-beam mullions. Mies explains how the mullions do not violate his less is more philosophy in a 1960 interview: "To me structure is something like logic. It is the best way to do things and express them". The mullions on his buildings reflect the inner structure and therefore give truth to the aesthetic of the