Purchase, sale, rental, leasing, valuation and management of built and unbuilt, own and third-party properties, execution of general and total contractor contracts, in particular planning and implementation of overbuilding projects, promotion and realization of own or third-party construction projects, project and construction management as well as monitoring and control of construction progress and construction costs. May establish branches abroad, found, acquire or participate in other companies, conclude company agreements and enter into interest groups, as well as conduct trust business.