Environment-Friendly
Acquisition Environmental Certification
MIRARTH HOLDINGS Group is promoting the development of buildings with high environmental performance to realize a decarbonized society, in line with the Group’s policy of “Providing environmentally friendly buildings and spaces.”
ZEH Condominium
Takara Leben is committed to supplying environmentally friendly ZEH condominiums*1.
- *1 ZEH (Net Zero Energy House): A house that simultaneously achieves a "comfortable indoor environment" and a "net annual residential energy consumption of approximately zero or less."
ZEH Condominium “LEBEN OITA EKIMAE MINAMI LUXES”
LEBEN OITA EKIMAE MINAMI LUXES (Oita city, Oita Prefecture) is a ZEH-M Oriented condominium that reduces residential primary energy consumption by approximately 28% and the condominium has received the highest rating of 5 stars (out of 5 scale) under the BELS, an energy efficiency rating system. Comfortable living space is realized by improving insultation and combining it with high-efficiency facilities such as LED high-efficiency lighting, hot water saving faucets, and Low-E double glazing glass.
ZEH Condominium "LEBEN TOYAMA JINZUHONMACHI ONE TOWER"
LEBEN TOYAMA JINZUHONMACHI ONE TOWER (Toyama City, Toyama Prefecture) by Takara Leben is insulated not only on the exterior walls and folded parts but also on the ceiling surface to ensure the high insulation performance required for a ZEH*1 condominium, and metal sashes and double-layer double glazing Low-E glass are used for openings.
The condominium has obtained Grade 4 in the "heat insulation performance grade" of energy conservation measures*2 (whereas ordinary condominiums are rated Grade 3), and Grade 5 in the "primary energy consumption grade."
In addition, the building has received the highest rating of 5 stars (out of 5 scale) under the BELS, an energy efficiency rating system that calculates the primary energy consumption of a house.
- *2 Energy measure grade: Established by the Ministry of Land, Infrastructure, Transport and Tourism as a grade that expresses energy-saving performance.
ZEH Condominium "LEBEN TOYAMA NISHICHO RESONACIA"
LEBEN TOYAMA NISHICHO RESONACIA(Toyama City, Toyama Prefecture) is the first ZEH (Net Zero Energy House) condominium in Toyama Prefecture. It has obtained the highest rating of 5 stars under the BELS, Energy Saving Performance Indication System, which calculates the primary energy consumption of a house and assigns a 5-star rating.
CASBEE Certification
MIRARTH HOLDINGS Group is promoting the acquisition of CASBEE* Building (new construction) certification, a comprehensive building environmental performance evaluation system.
- * CASBEE (Comprehensive Assessment System for Built Environment Efficiency): A system for evaluating and rating the environmental performance of buildings. It comprehensively evaluates the quality of buildings, including environmental considerations such as energy conservation and the use of materials and equipment with low environmental impact, as well as indoor comfort and consideration for the landscape.
Rental Residence “LUXENA YOGA”
MIRARTH HOLDINGS and Takara Leben are developing the high-grade rental residence “LUXENA YOGA.” It has obtained “Rank A” under CASBEE Building (New Construction), a comprehensive performance evaluation system for the built environment.
The energy-saving brand “Ecocube,” which combines energy-saving performance with high thermal insultation, has been adopted to improve indoor environment and energy savings, including lowering fuel and lighting expenses, through the introduction of highly insulated inner sash, high-efficiency air conditioners, heat-exchange ventilation fans, and other features.
A “geothermal heat pump system*” that uses geothermal heat is used for the heating and cooling systems in the common area, thereby reducing greenhouse gas emissions. Also, a “heat exchange ventilation system” has been adopted in each exclusive dwelling unit to ensure comfort by constantly supplying fresh air that is nearly room temperature. In addition to these systems, rooftop greening, and other features were added to the building, which was evaluated as a building with high environmental performance, combining energy conservation and high thermal insultation.
The project was also approved on December 7, 2023 as a grant from the Tokyo Metropolitan Government (Tokyo Metropolitan Environmental Public Corporation) for the “Local Production for Local Consumption Renewable Energy Augmentation Project”.This is the first attempt to use geothermal heat in the common areas of apartment buildings in Tokyo in the history of related subsidized projects.
＜Heat pump specifications＞
・Model: RWEYP224FAR
・Number of units: 1 unit
・Heating capacity: 25.0kW
・Cooling capacity: 22.4kW
- * Geothermal heat pump system: By burying three 95-meter-deep heat collection pipes in the ground, which has a stable thermal environment of 13 to 15℃ year-round, and circulating water through pipes, the system brings in warm water in winter and cool water in summer to the outdoor unit, saving more energy than air heat source equipment. This system, which is also used in the TOKYO SKYTREE, is specified as a renewable energy source to be promoted in the Basic Energy Plan and is expected to be a renewable energy source for a decarbonized society.
"L.Biz NIHOMBASHI"
At L.Biz NIHOMBASHI (Chuo-ku, Tokyo), an office building developed by MIRARTH HOLDINGS and its Group company, Takara Leben, we are working on heat load control of the building envelope to achieve environmental performance for the realization of a decarbonized society, in line with the Group policy of "providing environmentally conscious buildings and spaces” and working to improve the indoor environment by controlling room temperature and lighting. In addition, to encourage the use of natural energy such as sunlight, the building has a high floor height and curtain walls*1. Also, to protect non-renewable water resources, we are working to reduce water consumption through water-saving devices.
These environmental performances were highly evaluated, and the property was the first in our series of office buildings to receive the "A" rank in CASBEE*2 - Building (New Construction), a comprehensive assessment system for building environmental performance.
- * Curtain wall: A lightweight exterior wall that is installed to reduce the load on the building's structure by ensuring wind pressure from the outside and the watertightness.
Noda City Nakasato Logistics Facility Receives 5-Star BELS Certification
Noda City Nakasato Logistics Facility (Noda City, Chiba Prefecture), the first logistics facility built by Takara Leben in March 2022, has a policy of "developing environmentally friendly properties" and has a solar power generation system on the roof. The energy generated is used for a portion of the facility's electricity consumption. In recognition of these environmentally friendly efforts, the facility has received the highest rating of 5 stars under the BELS (Building Energy Efficiency and Low Energy Performance Labeling System).
MIRARTH Real Estate Advisory Initiatives
MIRARTH Real Estate Advisory (former Takara PAG Real Estate Advisory) promotes the acquisition of environmental certifications such as “DBJ Green Building*” and “CASBEE” for the properties it manages as part of its consideration for the environment in its asset management operations.
In FY2023, “HIGASHI IKEBUKURO CENTRAL PLACE” (Toshima ward, Tokyo) received certification of DBJ Green Building (rating: 1 star to 2 star) and “LUXENA TOYOCHO” (Koto-ku, Tokyo) received Rank A under CASBEE.
- * DBJ Green Building: This program was established in April 2011 by Development Bank of Japan Inc. to evaluate environmental initiatives through real estate. Comprehensive evaluation of real estate with environmental and social considerations, including not only environmental performance, but also tenant and community relations, and seismic adequacy.
Environmental Initiatives through ISO 14001 Certification
Recognizing the need to promote environmental friendliness in the general construction industry, Leben Home Build acquired ISO 14001 certification, the international standard for environmental management systems in 2008. We continue to operate our environmental management system by setting and regularly evaluating targets for reducing industrial waste resulting from our production activities at work sites.
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Separate trash at construction sites and promote recycling
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Separate and reduce waste at each business site.
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Regular cleaning outside the company by employees
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Propose plans and designs for energy conservation
Environmentaly Friendly Measures
“nasu mukunone”
Takara Leben opened its own hotel, “nasu mukunone” in April 2024. The hotel’s brand vision is “Relax and unwind in this living and breathing forest,” guests can stay in a vast natural setting of more than 35,000 square meters. On the premises, there is the “MIZUNIWA” designed by an architect Junya Ishigami and “AUBERGE” where you can enjoy local delicacies and elegant relaxation.
At “nasu mukunone,” natural water nurtured in the rich nature of Nasu Mountain Range is pumped up from the underground water veins and used as “natural hot water” in the semi-open-air baths in guest rooms under thorough quality control.
More than 10 species of wild birds, fireflies, and rare animals such as newts and frogs inhabit “MIZUNIWA.” We will continue to engage in biological conservation activities to coexist in harmony with nature.
Promotion of LEDs
For the purpose of effective use of resources and reduction of running costs, we are promoting the replacement of lighting installed in managed properties with LED lighting, which has a longer life and consumes less power.
Measures of Leben Trust
Leben Trust, a real estate leasing and management company, actively proposes environmentally friendly capital investments to owners, such as the use of LED lighting in common areas of managed properties, to promote energy conservation in buildings.
MIRARTH Real Estate Advisory Measures
MIRARTH Real Estate Advisory (formerly Takara PAG Real Estate Advisory), which is entrusted with asset management of Takara Leben Real Estate Investment Corporation, has implemented LED lighting in 45 of the properties it owns.
| Number of properties (including some partially implemented) |
Percentage of LEDs in portfolio | ||
|---|---|---|---|
| LED conversion | 45 properties | Total 75.6% | Common areas: 90.3% |
| Exclusive areas: 67.2% | |||
- (Based on floor space, as of the end of February 2024)
Environmental Measures in Office Buildings
MIRARTH Real Estate Advisory (formerly Takara PAG Real Estate Advisory) which is entrusted with asset management of Takara Leben Real Estate Investment Corporation is promoting environmentally friendly measures to reduce environmental impact and improve indoor environment.
To reduce water consumption in office buildings, we use rainwater for toilet flushing water, conduct awareness raising activities for tenants, and install "water-saving panels" to reduce the amount of water used in the water supply.
In addition, by displaying educational posters in common areas and tenants' private areas, we are promoting the reduction of greenhouse gas emissions and waste by fostering awareness of electricity conservation and the 3Rs.
Regular Cleaning Using Environmentally Friendly Detergents
As part of its commitment to environmental friendliness in condominium management services, Leben Community has officially introduced biodegradable plant-derived surfactants since FY2022.
Although vegetable-based detergents had been introduced on a trial basis at some properties since FY2021, the vegetable-based detergents at that time had less cleaning power than conventional detergents and did not meet the quality required for the services. After a number of trials and errors, we have officially introduced a detergent that does not fall under the PRTR system* and that takes environmental recycling into consideration. Currently, the detergent is used at sites where cleaning and janitorial staff belonging to Leben Community work.
- * PRTR system: A system under which business operators are required to monitor and report to the government the amount of chemical substances released into the environment (air, water, and soil) from their business sites and the amount transferred out of their business sites in waste materials, which may be harmful to human health or the ecosystem.
