ask for help about EAD renewal

I want to renew my EAD card. My category is family-based application (I-485). I got my original EAD from Vermont center. Where should I send the renewal application, Vermont or local office? I am confused because I also heard that for my category (I-485) the new direct mail address should be US Citizenship and Immigration Service, Chicago.
So which center should I choose? Does somebody renew your EAD based on I-485 category recently? If you know about it, please let me know.
Thanks.