On Google Maps, coordinates 18.422, -66.251 mark an empty plot labeled Alexa, categorized as Sculpture. Yet, no sculpture exists—only absence. The Puerto Rico Pavilion unravels this void through three sites: a bathroom stall, a roadside tent, and Facebook, where layers of inequality converged in tragedy. In February 2020, Neulisa "Alexa" Luciano, a homeless, Black, trans woman, was murdered in Toa Baja after a viral Facebook post accused her of wrongdoing. Once Upon Three Femisites reimagines the material and spatial conditions of these sites complicit in her femicide. Between a public toilet, a tent, and a short film on Facebook, the pavilion confronts violence, complicity, and exclusion.