If you’re planning to visit the Los Angeles County field office or any other USCIS office, there are some things you should keep in mind.
Firstly field offices are appointment only. Secondly, the office you are looking to visit may be closed or working at different hours than normal because of weather or something unexpected. Thirdly, recording inside an office is prohibited. Here recording means both video and audio recording and recording with a mobile or any other device. Finally, bringing weapons and ammunition inside is not allowed. The things that are considered a weapon include pepper spray, knife, and, of course, firearms.
If you want more information about your case, including filing fees, case status, immigration options, etc., you should check the online website first. The USCIS has plenty of tools and resources that it provides through the website.