Exterior, Prefab Building Type, Apartment Building Type, Metal Siding Material, Wood Siding Material, and Flat RoofLine Based in Portland, Oregon, MODSpdx is a West Coast builder with a holistic approach to customized and site-specific modular multi-family and commercial buildings. Buildings are constructed in their Portland factory, with a focus on proper ventilation and thermodynamics for the finished product through tight factory controls and an analysis of repeatable processes. Because the company works with a range of general contractors, architects, construction companies, and residential developers, their finished homes vary in aesthetics from traditional to contemporary.  Photo 4 of 7 in 7 Prefab Companies That Oregon Dwellers Should Know