The findings of this study are similar to those in other countries, in most of which the excess cost of green building was estimated at0–10%. The high rate of return on investment, stems mostly from savings on electricity (about 40% of the entrepreneur’s benefits)and increased worker productivity (about 60% of the entrepreneur’s benefits); even when disregarding the latter, and limiting the analysis to the physical aspects of the building, green building is still economic (Table 7).