• *1　Laminated veneer lumber (LVL)
  Engineered wood product made from slicer-peeled thin veneers, which are dried and laid up with parallel grain orientation, and bonded together under pressure using adhesive.
• *2　Glued-in rod (GIR) connection
  A method of joining timber using rods and adhesive.

Port Plus has a column capital seismic-isolation structure on the Basement Level 1 (B1) floor. The safety-focused design protects the timber structural frame from damage even in major earthquakes. To make the timber structure fire resistant, O·Mega Wood (FR) technology, individually approved by the Minister of Land, Infrastructure, Transport and Tourism, was applied. O·Mega Wood (FR) consists of three layers: the wooden core that supports the structure, a char-stop layer of gypsum boards, and a combustible timber outer layer. For the exterior-facing ground-floor columns, O·Mega Wood (FR) with three-hour fire resistance was used for the first time in Japan.

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In the construction of Port Plus, various advantages of timber structures were verified and realized. These include improved safety, as well as reductions in the construction period, on-site work and manpower, and impact on the surrounding environment.

Factory prefabrication of rigid moment-connection units for integrating columns and beams ensured their stable structural performance and improved on-site construction efficiency. The all‑timber superstructure eliminated the need for concrete placement, and prefabrication made on-site wood processing unnecessary, thereby reducing dust and noise on site.

Timber structure and finishes create biophilic spaces that support wellness where feelings of wood contribute to physical and mental health and also increase user comfort and concentration levels. The training space on the eighth floor features ceiling greenery, ambient forest sounds, and fragrant air conditioning aimed at stimulating the five senses. It is being used for various purposes as a place that contributes to employees' well-being.

Each training area has touchscreen panels (BMS interface) that display energy consumption and other information and offer easy control of the window blinds and lighting. The system allows users to adjust the interior environment to suit their comfort preferences.

Each room at the accommodation area is equipped with an iPad for users to control the room features. The iPad also tracks the user's sleep quality and displays their sleep score to encourage user understanding of wellness.

Port Plus has achieved LEED, an international system for holistically assessing efforts on energy efficiency and environmental impact, CASBEE Wellness Office S-rank, a Japanese certification system that assesses buildings in terms of user wellness and comfort, and WELL Certified Platinum, as well as the WELL Health-Safety Rating.

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Port Plus was built using 1,990 m³ of wood, which stores approximately 1,652 t of CO2. This is equivalent to about 450 t of carbon (*4) fixed. This amount, achieved by the all-timber building standing on a small, 565 m² plot, is equivalent to the amount of carbon that a 45,000 m² planted forest of cedars absorbs in 50 years. (*5) So, it is as if we created a secondary forest in the city.

According to LCA calculation (*6), we have reduced emissions by 1,700 t compared with the case of employing a steel frame structure. Furthermore, Port Plus has acquired ZEB Ready certification by cutting energy use to 50 percent or less compared with conventional buildings. This was achieved by reducing the air conditioning load and actively incorporating sunlight, solar heat, geothermal heat, natural light, natural ventilation, and other natural energy. Port Plus helps achieve carbon neutrality through energy savings in addition to carbon fixation offered by its timber structure and interior.