The primary goal of designing office spaces is to create an environment where employees can perform their tasks optimally. Among the factors that affect employee productivity, environmental and physical factors play a significant role, and this role is particularly important in research centers where knowledge creation and research activities are conducted. This is because the productivity of the workforce plays a more prominent role in these work patterns. Considering the role of environmental factors and the importance of research centers among office spaces, the aim of this paper is to elucidate a conceptual model of the relationship between environmental variables that affect employee productivity in research centers. The research is developmental in terms of its purpose and descriptive in terms of its method. After a review of the literature, 31 initial variables were extracted and reduced to 16 variables based on expert opinions using the Delphi method. The variables were classified into three levels according to Whisler's model. The data collection tool was a questionnaire, and the study population included 4 architecture and urban research centers in Tehran. In the inferential analysis, confirmatory factor analysis (CFA) and partial least squares (PLS) path analysis were used to test the hypotheses using the LISREL.10.2 software. The findings of the research showed that the physical, functional, and psychological dimensions of the work environment have a significant impact on the productivity of employees in Tehran's architecture and urban research centers. Among these, the most important physical factors are, in order: temperature and ventilation, noise and acoustics, lighting and ergonomics. The most important functional factors are, in order: office layout, dimensions and proportions, spatial organization, naturalism and transparency. The most important psychological factors are, in order: privacy, security, interactions, and ownership. The work pattern also has the strongest relationship with psychological factors and no significant relationship with physical factors.
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