This paper provides an empirical analysis of office building rents using data for a five‐year period in a medium‐ sized city. The results indicate that rent levels respond to various factors in the expected manner: rents vary systematically across classes of buildings and locations, overall market conditions have a significant impact on rents, and contract variations are associated with rent differences. We also present the first evidence at the building level on the rent‐vacancy adjustment process. The results show a significant relationship between rent changes and vacancies.