Construction, purchase and sale, financing and brokerage of all real estate, provided that these operations are not subject to the Federal Act on the Acquisition of Real Estate by Foreigners of December 16, 1983 (LFAIE); any study, organization, planning, promotion and realization of real estate projects; any analysis, expertise, assistance, advice, provision of services and performances in the field of real estate, commerce and construction; keeping of accounts and all fiduciary work (cf. statutes for complete purpose).