Palacio Elortondo Alvear, Gothic Revival building at Florida Street and Corrientes Avenue, Buenos Aires, Argentina

The Palacio Elortondo Alvear is a neo-Gothic residence at the corner of Corrientes Avenue and Florida Street in San Nicolás, Buenos Aires. It originally had no chamfered corner: the ground-floor shop entrance was set in the angle, with two doors separated by a corner column, now narrowed. A marble-clad staircase, kept in the 1994 remodelling, led up to the family's rooms.

The building's architect is unknown; some sources name Edward Taylor, but Schávelzon argues the ornate facade rules out his more sober style. Construction is presumed to have occurred between 1870 and 1880, and the 1882 Alvear–Elortondo wedding supports a date near the end of that decade. The land had belonged to Ana Díaz, the only woman with vecina rights among Buenos Aires's founders.

This residence hosted the 1882 wedding of Carlos María Diego de Alvear and María de las Mercedes de Elortondo, marking a significant moment in Buenos Aires high society. The upper floors still carry traces of the grand social gatherings that once defined life here.

The ground floor has been repurposed many times over, housing everything from the leather goods store Casa Mayorga to contemporary retail shops. The upper floors are best viewed from across the street or from the corners where you can fully see the architectural details of the facade.

The building's architect is unknown; some sources name Edward Taylor, but Schávelzon argues the heavily ornamented facade rules him out, since his works were plainer. The marble staircase to the upper residence survived the 1994 Burger King remodeling, which erased most original rooms and the facade.