"Sho-u-kan" is a part of the former residence of Count Abe, the former lord of the Fukuyama Domain, built in 1892 in Nishikata-cho, Hongo-ku, Tokyo. In 1971, Tokio Kasuga, the founder of Green Stamp Co., Ltd., relocated and restored it in Karuizawa, and it has been used as a memorial hall for the Green Stamp Karuizawa dormitory. In 2020, Sho-u-kan was renovated at the same time as the newly renovated annex, to be used as a retreat facility by both Green Stamp Co., Ltd. and Kennedyx Co., Ltd. Our company was in charge of the design and interior administration of the Sho-u-kan renovation, including seismic retrofitting, as well as the installation of FF&E (First Floor & Energy) equipment throughout the facility. [Social Issues / Customer Issues / Requests] Since its initial relocation, various additions and renovations have been carried out, and the connection to the other building is only made at the point of a corridor, and structural stress has been placed on the building, resulting in settlement. The entire facility was aging, and in the case of Sho-u-kan, it was difficult to use in winter due to the climate of Karuizawa. Also, although it originally had tatami mats, the frequency of its use had decreased due to changes in the lifestyle of Japanese people. However, there was a desire to renovate it while preserving as much of its original appearance as possible. [Solution] Based on an investigation of Sho-u-kan, it was restored as much as possible to its simple form from when it was relocated, and a seismic diagnosis was conducted to reinforce the structure to withstand seismic forces equivalent to those stipulated by the Building Standards Act. It faces the annex across a courtyard, giving a sense of unity to the entire facility. While respecting the original design as much as possible, the aim was to extend the period of use, including winters other than the coldest period, by installing insulation and air conditioning equipment in the unseen parts. Underfloor heating was installed and the flooring was changed to hardwood, and the walls added for seismic reinforcement were made to express the original image of the walls, fixtures, etc., and the upper half of the space was preserved as much as possible of the original design. <Our Project Members> [Sales] Kayu Tatsumi [Survey, design, layout, and interior administration] NAU1: Norio Koito [Production and construction] Mikiya Fujitaka