This paper presents a set of special requirements to development of intelligent building control software. It includes the degeneration technique (gradual reduction of the building service level). The method involves an organized activities sequence that results in artifacts such as models and control software specifications. These specifications assure the desired dynamic behavior of system and also include degeneration features. It also presents a specific example related with the control in Intelligent Building which has been adopted as case study and illustrates the application of the proposed method.