Obrascon Huarte Lain engages in the concessions and construction businesses. The Company operates through Engineering and Construction, and Development segments. The Engineering and Construction segment provides civil engineering works and building construction services for public and private-sector customers, and designs, constructs, maintains, and operates industrial plants and systems, such as oil and gas, energy, solids engineering, and fire safety systems. It also offers properties and infrastructure maintenance services for housing and office properties. The Development segment develops and operates mixed-use hotel-related real estate projects.