At first I thought adding more pages or renewing the passport means going to the U.S. Embassy. Turns out, I only had to visit the ACS office in Shanghai. ACS is the abbreviation for American Citizen Services or the formal official translation: U.S. Citizen Services. The office is located at 1038 West Nanjing Road, Westgate Mall (8th floor), just about 7 mins walk from line 2, West Nanjing Road subway station. (Talking about Shanghai of course)
Don’t be shocked by the long waiting line when you get out of the elevator. If you are an U.S. Citizen (assumed that you are), just show your U.S. passport along with your printed appointment paper (if you have one) to the security guard and tell them your reason of visit, then you will be permitted to enter without waiting. The staffs there are nice and polite, but I think this kindness stops when you are not an U.S. citizen. Someone (non-U.S. Citizen) did get yelled at badly for asking a question too slow, lol… But all of this only happened at the entry gate.
The cost for adding pages to your current passport is $82 USD, which comes to 549.40 RMB, same price for 24 or 48 pages. The process only takes about 20-30 minutes after they received your application, just wait there until they called your name.
Renewing passport costs $110 USD, about 737 RMB (24 or 48 pages) and it takes about a week to process (excluding weekends/holidays). After submitting the application, you get to keep your current passport for you to obtain your visa information. An email notification will be sent to you once the passport is ready, then just bring your current passport and receipt when you go pick up the new passport. Once you arrived and entered the office, go straight to the cashier’s window and ask for pick up, you don’t need to make an appointment or take the waiting ticket… which I did and sat there for 30 mins for nothing, duhh.