The design of office buildings can substantially improve the building, social, and ecological performance of office building projects. However, existing research on improving the performance of work environments has primarily focused on identifying and evaluating methods to make work environments less bad, rather than focusing on how to develop work environments that are positively performing. Moreover, the potential of building projects to perform positively, in terms of economic, social, and ecological performance, remains relatively unexplored in existing research and building projects. To this end, this PhD research project is focused on exploring the positive economic, social, and ecological performance potential of buildings. Specifically, this research project identifies and evaluates the potential economic, social, and ecological performance benefits of integrating microforests into office buildings. Explorative design case studies, systematic literature reviews, expert interviews, observation case studies, and experimentation research methods were employed, in order to explore and evaluate the performance potential of microforests, as well as develop design guidelines, performance metrics, and high performance space types and case studies. The results of this research project make it evident that the design of constructed environments has a significant impact on the performance and value of building projects, from economic, social, and ecological performance perspectives. More specifically, the integration of microforests into office environments was found to yield a diverse range of building, worker, and ecological performance benefits. For instance, the incorporation of microforests into office environments was found to improve occupant thermal comfort, and in turn, building energy consumption rates. In addition, the results of one of the studies suggests that knowledge workers prefer to conduct a wider variety of work tasks in microforests, compared to a range of existing work space types, than existing research suggests. Thus, the incorporation of microforests into office environments may improve occupant worker performance and comfort, as well as building energy consumption rates, simultaneously.