Demolition is underway at the Tree of Life synagogue in Pittsburgh, Pennsylvania, which was the site of the deadliest antisemitic attack in U.S. history.

The work that began Wednesday is part of the effort to reimagine the building to honor the 11 people who were killed there in 2018.

Most of the building will be removed, although parts of the sanctuary walls will be maintained.

The new building will include spaces for worship, a museum, an education center and a movie theater.

Carole Zawatsky heads the nonprofit overseeing the project.

She said she had a mix of emotions, including feeling bittersweet knowing why the original building was being demolished but also feeling a great deal of excitement about seeing the project getting underway.

The October 27, 2018 attack claimed the lives of 11 worshippers from three congregations meeting at the synagogue, Dor Hadash, New Light and Tree of Life.

Last year, the man who killed the congregants was sentenced to death, after the conclusion of a long-delayed federal trial.