Visitor Visa Extension

[aneelbt]

I am planning to extend the stay of mom who came her on visit. What is fee that I need pay and to what address I need to send the application. Last time, I remember sending it to St.Albans, VT. The website is giving the Dallas address.
I live in Houston.

Thanks in advance

[immihelp]

Addresses have changed recently.

Details at https://www.immihelp.com/visitors-visa-extension/