Automated information system BTI 3.0 is put into operation. Migration of server part of the existing system to Linux platform and Informix Online Dynamic Server 9.2 was performed. Windows 2000, ME, XP are added as client part platforms.The features of the version are: data model extension according with new estate legislation; integration with graphic editors in order to create land-use plans and floor plans. The system was designed for Novosibirsk Municipal Office of Technical Inventory and is in use since 1997.