Annabi had originally opposed the real estate projects, including a $685 million retail development known as Ridge Hill.
But Bharara says she switched her votes under the influence of more than $166,000 in payments arranged by her co-defendants.
Also charged are Zehy Jereis, the former head of the Yonkers Republican Party, and Anthony Mangone, a Westchester County attorney.
Annabi's lawyer says her client is innocent.
