USCIS has recently updated the filing addresses for Form I-129, Petition for a Nonimmigrant Worker. The most up-to-date filing addresses are listed on the USCIS webpage entitled “Direct Filing Addresses for Form I-129, Petition for a Nonimmigrant Worker” which appears to have last been updated on February 28, 2019. Notably, the P.O. Box addresses, and the floor and room number for H-1B regular cap subject petitions and H-1B advanced degree exempt petitions (master’s cap) listed on this USCIS webpage have recently been updated.
For example, during last year’s H-1B cap filing season, the filing address for an H-1B regular cap subject petition filed with the California Service Center using FedEx, UPS, and DHS delivery services was to be mailed to: USCIS California Service Center, Attn: I-129 H-1B Regular Cap, 24000 Avila Road, 2nd Floor, Room 2312, Laguna Niguel, CA 92677.
This year, as of March 8, 2019, the USCIS website indicates that H-1B regular cap subject petitions filed with the California Service Center using FedEx, UPS, and DHS delivery service should be mailed to: USCIS California Service Center, Attn: I-129 H-1B Regular Cap, 24000 Avila Road, 1st Floor, Room 1600, Laguna Niguel, CA 92677.
Source: AILA Doc. No. 19031100.