A model was developed to measure the quality of office design in terms of employee work efficiency. This approach included three domain facets, such as three overall impressions of the building, nine areas of the environment, and six criteria to judge office quality. Two five-point rating scales were used in the facets assessing : (1) present quality and (2) future importance. The results of an office building survey (307 offices, 159 questions) show the importance of design aspects in regard to work efficiency through regression analysis. The aspects with the highest contribution to work efficiency are linked to a list of indicators for the monetary value of office design improvements: fire extinguishers; fire escape routes (r²=0.77) or natural light; cleanliness of the entire building (r²=0.57) or work stations; as well as furniture and light regulation in single offices (r²=0.54). The results allow for the ranking of design aspects in terms of associated benefits.