This research by two professors from the Universities of Arizona and Indiana highlighted the most often high return on investment of "responsible" property: energy efficient, transit-oriented and urban regeneration office properties.

This paper written by a professor from the University of San Diego and two leaders of the CoStar real estate data basis highlighted a higher price of "green" (LEED and Energy Star) office buildings on the American market.

This research team from the Universities of Maastricht and California (Berkeley) highlighted a rent and a price premium for the green offices on the American market.

According to two researchers from the Henley Business School (University of Reading), the level of the rents and of transaction prices of "green" office buildings are significantly higher on the American market.

Two researchers from the Lawrence Berkeley National Laboratory (USA) and the Helsinki University of Technology studied the links between indoor environmental quality (temperature, ventilation, air quality...) and work (absenteism, productivity...).

One of the founders of E Capital company, in his study for the Massachusetts Technology Collaborative, estimated the health and productivity benefits of "green" buildings.

Gregory Kats produced a costs-benefits analysis of green American schools, including a monetarization of the students increased learnings.

Scott Muldavin, from the Green Building Finance Consortium, criticized the N.Miller, J.Spivey and A.Florance study on a methodological, technical and presentation point of view. But he did not repudiate the study's conclusion: the sustainable buildings are more valuable.

The "Green Value In Use" Task Group made a first presentation of its work at the 2009 Annual Conference of Sustainable Building Alliance (SB Alliance).

Interesting case study of 117 dwellings near Geneva. Energy performance is higher than the one of usual real estate but less high than planned, because of drying process, indoor temperature and complexity of technical installations. Such study is in our "Costs and Profitability" item, because a lower real performance means a lower profitability of investment.

On average, LEED buildings use 18-39% less energy per floor area than their conventional counterparts. However, 28-35% of LEED buildings use more energy than their conventional counterparts. Further, the measured energy performance of LEED buildings has little correlation with certification level of the building, or the number of energy credits achieved by the building at design time. This research and the one on Minergie (and the one in French on HQE) highlight that the energy and environment efficient buildings approach must deal not only with design but also with operation.