Yes, my fiancee got dropped off near the McDonalds and walked from there.
In fact, I was getting ready to share her I-94 extension experience (27-Jun-2020). The walk-through written by multiple users on this thread helped a lot.
After getting dropped off, she talked to an officer outside the blue building about her situation and there was minor snafu. She showed her I-797 with an expiration of Mar2022 but forgot to mention that her most recent I-94 had an expiration date of Aug2020. The officer told her that she doesn’t need to cross border as her I-797 doesn’t expire until 2022. He told her that she can cross at her own risk if she wants and then he went back into the building.
She waited for another 5 mins until a security guy called a supervisor to help her out . I think she explained her situation correctly and she was told to cross the border for I-94 extension.
Rest of the process went smoothly and I think it took at least 2 hours. While waiting in the line, she asked an officer to see if they could let her through but it didn’t work.
One thing to note is that they did not issue a paper I-94. They only stamped her passport with an arrival date and admit until date. I checked the CBP website after the stamping and the"admit until" date was updated to Mar2022.
If anyone is planning to go there, please review this thread thoroughly. Let us know if there are any other questions.