In the preparations for the Games, the city of Rio promised “no white elephants” and outlined plans for facilities to be turned into public sporting areas and schools. The arena that hosted taekwondo and fencing was to be transformed into a school. Two other arenas were to be taken apart, and one put back together as four schools in another area. None of that has happened.

The mayor’s office said those plans were still in the works, but it did not offer a specific timetable.

The decay of Olympic sites is happening as a financial crisis engulfs federal, state and municipal governments. “The nation is in crisis, Rio de Janeiro is in crisis — it’s time to be cautious,” Marcelo Crivella, who became mayor on Jan. 1, told incoming city council members.

“Spending is prohibited,” he added.

Rio’s mayor during the Games, Eduardo Paes, was among the strongest evangelizers of an Olympic legacy. He said in an email that it was too soon to call any of the sites white elephants and that “the path to implementing a legacy has been given.”

After the Games, the city held an auction for private companies to bid on administering the Olympic Park, but there were no bidders. That left the Ministry of Sport, an organ of the federal government, with the financial burden. The minister of sport, Leonardo Picciani, said in an interview that the agency’s goal was to find a private company to take over the park, but because there has been no interest, it is the government’s responsibility to maintain the sites.