A house on the Pasaje San Lorenzo in San Telmo, 2.4 metres wide — the narrowest building in Buenos Aires, and one of the narrowest inhabited houses in Argentina. The pasaje (alley) it stands on is itself picturesque: a cobblestoned pedestrian passage lined with 19th-century buildings that have been better preserved than most of the surrounding street fabric.
The house is privately owned and not open to the public, but the exterior is well worth the short detour from the Pasaje San Lorenzo entrance off Carlos Calvo. The alley itself, running between Defensa and Humberto Primo, is one of the better examples of early colonial street scale surviving in San Telmo.