The powder magazine built in 1769, “El Polvorín de San Gerónimo”, designed by military engineer Thomas O'Daly, is still located on the grounds of the park.

The east side of the park is bordered by the Puerto Rican Supreme Court building designed in 1952-56 by architects Toro Ferrer.

Subsequent major restorations have been directed by architects Orval Sifontes in the 1970s, Otto Reyes Casanova in 1990–93, and by Andres Mignucci, in 2000–04, who also wrote about the park's history in his book [Con]textos: el Parque Muñoz Rivera y el Tribunal Supremo de Puerto Rico.

[3] In 2015, then mayor of San Juan Carmen Yulín Cruz announced the park would be used for educational purposes.

In late December 2018, the park was the venue for a large fashion show raising awareness for the HIV pandemic.