Garcia, who ran as a technocrat based on her long service in city government, made brief remarks at the Women's Rights Pioneers Monument in Central Park on Wednesday.
"For 400 years, no woman has held the top seat at City Hall," she said. "This campaign has come closer than any other moment in history to breaking that glass ceiling and selecting New York City's first female mayor. We cracked the hell out of it, and it's ready to be broken."
Adams, a former police captain who put public safety at the heart of his campaign, is poised to become the next mayor of the most populous U.S. city. He is heavily favored in November's election against the Republican nominee, Curtis Sliwa, the founder of the civilian patrol Guardian Angels.