There has been a recent change in the direct filing location for Skilled Worker I-140 Petitions, which must now be filed at the Dallas Lockbox.
This now means that ALL I-140 Petitions that are not premium processing must be filed with the Dallas Lockbox.
USCIS Dallas Lockbox
For U.S. Postal Service (USPS) deliveries:
USCIS
P.O. Box 660867
Dallas, TX 75266
For Express mail and courier deliveries:
USCIS
Attn: AOS
2501 S. State Highway 121
Business
Suite 400
Lewisville, TX 75067