Between 1950 and 2000, SEA, SEM, or SEL focused primarily on the design, real estate management, and construction of apartment buildings. At its core, the firm was composed of the husband-and-wife team of Abraham Schapira and Raquel Eskenazi, alongside a succession of partners: León Messina (1966–1978), Mario Lifschitz (1978–1981 and 1984–2000), and Pedro Iribarne (1980–1983). SEA defined its work as "purely commercial, yet always dignified and of high quality in terms of design and finishes"—a hallmark that became its brand in the real estate market.
