2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/73573We study the asymptotic cones of the universal covering spaces of closed 4-dimensional nonpositively curved real analytic manifolds. We show that the existence of nonstandard components in the Tits boundary, discovered by Christoph Hummel and Victor Schroeder, depends only on the quasi-isometry type of the fundamental group.13 pages; Minor changes. To appear in International Mathematics Research Notices (IMRN)Metric GeometryDifferential Geometry53C20 (Primary); 20F67, 20F69 (Secondary)text