The New York City deputy mayor who oversaw housing and economic development, and was said to have played a key role in helping orchestrate the deal to bring a portion of Amazon's second headquarters to Queens, is stepping down from her post.

City Hall confirmed Wednesday night that Deputy Mayor Alicia Glen is leaving Mayor Bill de Blasio's administration.

The mayor's office did not specify why Glen was stepping down, who may take her place, or when would be her last day at City Hall.

"Deputy Mayor Glen has been a crucial member of our administration since the very beginning. She has made this city stronger and more fair," the mayor said in part in a statement. "I thank her for her work and look forward to continuing to work with the many talented people she has recruited to public service."

Glen also oversaw the embattled New York City Housing Authority (NYCHA), and was the point-person for the city's plan to preserve thousands of affordable housing units.

She was de Blasio's longest-serving deputy mayor, starting at the beginning of his first term.