English: Built in 1964-1965, this International Style Modern office building has surprisingly little information available about it. The building replaced the historic Vilas mansion, home to several notable early and prominent citizens of Madison, and a favorite building of Frank Lloyd Wright. The demolition of the mansion and construction of this building catalyzed the creation of the historic preservation movement in Madison and the state of Wisconsin, as it was massively out of scale with the surrounding buildings and the loss of a historical landmark as significant as the Vilas House made many in the community realize the need to protect the city’s historic resources. The building features a glass curtain wall, seemingly inspired by Ludwig Mies van der Rohe, sandwiched between a parapet and floor structure clad in metal panels with a trapezoid geometric motif at the top and bottom, which is seemingly inspired by Frank Lloyd Wright, a recessed first floor with Le Corbusier-inspired pilotis, or exposed columns, around the perimeter of the floor, framing storefronts, and clad in stone panels, a penthouse with an oversized cap, exposed columns, and stone panel cladding, a low-slope roof, and a large lawn to the side and rear, which conceals the building’s underground parking garage. The building, despite being a quite excellent example of mid-20th Century modern architecture, is a noncontributing structure in the Mansion Hill Historic District, listed on the National Register of Historic Places in 1997. The building’s architecture seems to have escaped notice by the local architectural historian and history groups despite being a quite well-designed International Style building.