In order to learn lessons from the unprecedented disaster and contribute to the improvement of disaster mitigation measures, the National Institute for Land and Infrastructure Management (NILIM) and the Building Research Institute (BRI) has sent staff members to the affected regions and conducted extensive surveys on the damage to buildings and residential lands caused by the earthquake, tsunami and subsequent fires. The types and parts of buildings on which these surveys have been conducted included wooden houses, reinforced concrete buildings, steel buildings, residential lands, non-structural components and seismically isolated buildings. In addition, NILIM and BRI have conducted scientific researches on the earthquake and tsunami and analyzed recorded strong motions from various sites across Japan. This report consists of the main results from these surveys and researches.