Providing building technology services, namely, virtual design and construction (VDC) services, namely, virtual design and virtual construction of commercial, industrial, residential and government buildings; development of integrated multi-disciplinary computerized models of work flow for construction and design-construction projects; computer aided design for others; computerized modeling services, namely, design and development of building information models (BIMs) of the type used for visualizing and managing design-construction projects; structural design design-assist services in the field of construction and renovation of commercial, industrial, residential and government buildings; layout planning of buildings and infrastructure systems for buildings; layout and planning of commercial, industrial, residential and government buildings; consulting in the field of computer-aided modeling of design-construction projects; consulting in the field of construction engineering