Abstract
There are policy measures available to increase floor-to-area ratios applicable to urban development which offer public open spaces. The expansion of the measures is under consideration in order to take into account their environmental actions and improve carbon emission efficiencies. However, it is not easy to ensure continuity of low carbon energy uses in the developed areas, because the measures just enhance the planning and constructiton of low carbon building. In this study, we assumed a new scheme to increase floor-to-area ratios for development zones which have a goal of zero carbon emission by energy conservation and energy creation, and commit to the use of renewable energy for the remaining portions supplied to the area from the electrical grid. In an case study, it was calculated that the additional expenses incurred from the purchase of renewable energy were equivalent to approximately 10% of the incremental rent generated by the increase in the floor area ratio. It is revealed that the policy measures are applicable to the cartain areas of high rent, and that it supports the various voluntary and continuing initiatives to improve carbon emission efficiencies in the developed areas.
