Empirical researches have repeatedly proven the presence of premium in green buildings around the world; however, supply of such buildings in Taiwan was sparse even though the government promoted for more than a decade. This study aims to determine whether Taiwanese green building premium is developer-induced or market-driven. We collect green condominium building advertisement in New Taipei City to calculate advertisement greenness and compare with transaction data. The result shows that increase in development cost and market demand both have impact on price premium, but being green is not the main eye-catcher in advertisements. Advertisements for residential buildings focus mostly on green or not green but not how green.