Orion Structural Group, Inc. (OSG) is a collaborative structural engineering team based in Thousand Oaks, California. OSG provides structural design services for commercial, residential, educational and historical facilities. Design services include, but are not limited to:- Seismic Retrofit/Renovations- New Construction- Historical Renovations - Educational Facilities (Renovations and New Designs)- Hill Side Structures - Accessory Dwelling Units (A.D.U.'s)