Mirador Massüe, Art Nouveau building in San Nicolás, Buenos Aires, Argentina

Mirador Massüe is the surviving corner tower of the Palacio Costaguta, a two-block apartment building designed in 1903 by Alfred Massue at Talcahuano and Tucumán, facing Plaza Lavalle. The tower's first-floor balcony and crown carry Art Nouveau female faces and plant motifs. Since 1989 the dome stands atop a postmodern office block with a glazed facade banded in maroon.

Alfred Massue designed the rental building in 1903 for David Costaguta, who likely anticipated the rise in land value once the Palacio de Tribunales opened opposite Plaza Lavalle in 1910. In 1989 the corner block was auctioned to UNIBON SA, which planned a contemporary office tower; after public protest, only the mirador tower was kept and the rest rebuilt as offices.

The building displays French and Italian architectural influences that shaped Buenos Aires at the time, featuring curved facades and floral patterns reminiscent of European styles. The glazed balconies and ornamental details tell of the city's yearning for European elegance in the early 1900s.

The building sits in a central area with good public transportation access, restaurants, shops, and other historic structures nearby. Visitors can easily admire the exterior facade from the street and study the architectural details at their own pace.

The corner block was bought at a judicial auction in 1989 by UNIBON SA, which planned a contemporary office building. After public protest, architect José María Peña was consulted and only the mirador tower was kept, now framed by a postmodern glass facade with garnet horizontal bands. The Tucumán Street block, at numbers 1325 and 1349, stayed intact.