Chamartín is where Madrid's business spine meets its calmer residential streets, and it's the district most international corporate relocations end up in. The western edge — AZCA, the Paseo de la Castellana, the Santiago Bernabéu, the Cuatro Torres — is corporate Madrid, with hotels and business services. East of Serrano, the character shifts: El Viso, Nueva España, and Hispanoamérica are lower-rise, quieter, and school-heavy. The district's single defining feature for international buyers is the density of English-language schooling within a 2 km radius — a concentration unmatched anywhere closer to the center.