A model for calculating the break even points among facilities investments and benefits induced by facilities, was constructed and cost collection of pre-design research for offices was discussed. Applying the model reveals that the rate of building construction to the total expense for office tenants is smaller than that for building owners. Some calculations on break even points reveal that pre-design research with a focus on space saving of one square meter or time saving, especially one minute in every working day for as many workers as possible, is valuable and provides a chance to collect human expenditure for the purpose of research.
