Werner Keng, a senior official in the education and arts ministry in the German state of Bavaria, said that the Munich memorial was expected to open to the public by September 2016. Keng said that the creation of a monument to the victims of the Munich attack was long overdue, and he speculated that the hesitation to do so earlier had been related to embarrassment among some in the German government.

The attack, which took place during an Olympics designed by the Germans as a way to showcase the changes in their country in the postwar era, involved a number of acknowledged security lapses and errors. “Everyone agrees that many mistakes were made; it was a terrible disaster,” Keng said. “The memorial — it’s late, but from our point of view, it’s not too late.”

Keng said the memorial would be near the building in the athletes’ village where the Israelis had been held hostage. It is expected to cost about 1.7 million euros (a little less than $2 million), and the costs are being shared by the Bavarian government, the German federal government, the I.O.C. and the Foundation for Global Sports Development, an organization dedicated to promoting fair play and other sports-related initiatives.

David Ulich, the president of the foundation, which had been tracking the families’ efforts, said the election of Thomas Bach, a German, to the I.O.C. presidency in 2013 had been a turning point in the process. The Bavarian government had begun discussions about building a memorial in 2012, and once he replaced Rogge, Bach quickly pledged the involvement of the I.O.C. Bach is a former Olympic fencer who competed at the 1976 Montreal Games, and he had a personal connection to some of the victims of the Munich attacks.

Under previous presidents, the I.O.C. had frustrated families of the victims in their attempts to have the Munich attack officially commemorated at the Games. While Olympic officials attended memorial events organized around the Games — Bach joined Rogge and others at the one in London in 2012 — there was never any movement from the I.O.C. to have an official moment of silence for the victims.

Advocates for the families have often questioned how big a role politics has played in the I.O.C.’s declining to memorialize the victims. Spitzer said she understood the awareness of the Israeli-Palestinian conflict and the I.O.C.’s fears about politicizing the Games, and for that reason she often stressed to officials that a tribute did not have to be about “the Israeli team.” Rather, she said, she pushed the I.O.C. simply to have a moment in which current athletes would be made aware that in the past, “11 members of the Olympic family arrived with a dream and went home in a coffin.”