Around this time Abend began to receive commissions to stage interventions in urban and architectural environments, such as the cement mural on the façade of the Teatro Teresa Carreño, and the interior design of the Sala Plenaria in the east tower of Parque Central, both in Caracas.

Between 1965 and 1970, Abend was the professor of tridimensional composition at the Neumann Institute of Design, where other renowned artists such as Gego, Gerd Leufert, Nedo, Manuel Quintana Castillo, Guillermo Meneses, and Luisa Zuloaga de Palacios taught similar courses.

Abend's sculptures are done mainly in wood, bronze, and concrete; he is also known for designing high-scale architectural elements of important buildings, such as the façade of the Teatro Teresa Carreño, the ceiling of the Caracas Israeli Union synagogue, and the new perimeter fence of the Court of Supreme Justice in Venezuela.

The elegant nature of his jewels is such that he was commissioned by the Venezuelan Government several times to craft pieces as gifts for important diplomatic personalities (e.g., he produced a complete jewelry set for Patricia Nixon while she was the First Lady of the United States).

By that time, he had abandoned polished surfaces and made, for his second solo exhibition (Museo de Bellas Artes, 1965), bronze reliefs of abrupt geometric volumes and works influenced by Informalismo, in which his interest in the medium prevailed.

He created different types of constructive-geometric assemblages, some by means of thick strips whose structural severity contrasted with their irregular reliefs, others combining small pieces arrayed in a rigorous and, at the same time, delicate order, and presented them in the exhibition Puertas, ventanas y relieves at the Sala Mendoza (1980).

He also produced a series of conceptual works in which he placed leftover shavings of his woodwork in boxes, giving birth to a sort of "esculturas en negativo" (sculptures in negative).