This is one of the first researches on price differentials of green buildings in Asia. Using a rich set of data on condominium transactions and mandatory evaluation of environmental performance in Tokyo, we estimate the effects of itemized green scores on transaction prices. Although green condominiums are on average traded at a premium, the premium is mainly attributed to the building age and quality. After controlling for relevant attributes, we find significant price discounts for newly constructed green condominiums. However, green condominiums experience little depreciation at least during the initial years. Using itemized scores, we find that the long-life design mitigates price discounts, but other factors such as the use of eco-friendly materials, renewable energy, water reuse, and greening exacerbate discounts. Several possibilities are discussed including high future maintenance costs of green condominiums.