Reducing Environmental Impact through Business Activities

Obtaining DBJ Green Building/CASBEE Certification

Mitsubishi Estate endeavors to be socially-conscious and environmentally-friendly in its real estate dealings and to proactively communicate its environmental initiatives.
As of the end of March 2018, 20 of our properties had obtained the DBJ Green Building certification administered by the Development Bank of Japan (DBJ).
Under this certification system, the DBJ comprehensively evaluates environmentally and socially-conscious real estate properties (green buildings) on five factors: the building's environmental performance, the comfort of tenant users, risk management, consideration for the surrounding environment and community, and cooperation with stakeholders. The building then receives certification with one of five rankings (from one star to five stars) based on its score, which shows the positive feedback given to the environmentally-friendly initiatives undertaken by our company's developed properties.
Furthermore, nine of the company's buildings obtained CASBEE (Comprehensive Assessment System for Built Environment Efficiency) certification. CASBEE is a certification system under the auspices of the Ministry of Land, Infrastructure, Transport and Tourism which ranks and evaluates buildings on various aspects including comfort and environmental performance.
Going forward, we will continue to develop valuable real estate and promote them to tenants, investors and other stakeholders in response to increased interest in and expectations of environmentally-conscious buildings.

List of Mitsubishi Estate's certification results (PDF 123KB)

Number of projects recognized with CASBEE (new construction design)/Development Bank of Japan (DBJ) Green Building/ABINC certifications

9/20/22 buildings and projects

Diverse Initiatives to Improve Environmental Performance of Condominiums

Mitsubishi Jisho Residence employs the Five Eyes process to ensure the quality of its residences. Eco Eyes is one of the five. The company uses various creative approaches to support eco-friendly, affordable lifestyles.

1. Soleco power systems save electricity and money

Soleco is an environmental system that balances environmental friendliness with affordability by reducing electricity costs for condominium units and shared areas. This is achieved by combining high-voltage collective power systems with solar power systems in condominiums.


Rate of annual adoption for soleco system

58.8% a year

(Note) KPI calculations are for newly built condominiums transferred en bloc in fiscal 2017 (with the exception of some properties from joint businesses, such as projects not managed by the company).

2. Various techniques enhance insulation effectiveness

Mitsubishi Jisho Residence uses a range of techniques to enhance insulation effectiveness, such as applying external and internal insulation, taking measures to prevent dew condensation and using multi-layered glass.
In line with the 2013 energy conservation standards for residences that went into full effect on April 1, 2015, the company aims to earn insulation performance level 4 and primary energy consumption level 4 for all the residences for which it makes application for building confirmation thereafter.
In fiscal 2016, The Parkhouse Futakotamagawa Midori no Mori and The Parkhouse OIKOS Mikunigaoka were both certified as low-carbon buildings under Japan's Law on the Promotion of Low-Carbon Cities.

Rate of annual adoption for heat insulation functions level 4


Rate of annual adoption for primary energy consumption level 4


(Note) KPI calculations are for condominiums for which planning permission was granted from April 1, 2015 and newly built condominiums transferred en bloc in fiscal 2017 (with the exception of some properties from joint businesses, such as projects not managed by the company). Properties in the Sapporo and Sendai regions are not included in the KPI calculations.

3. Highly efficient devices save energy

In the condominiums sold by Mitsubishi Jisho Residence, high-efficiency equipment is adopted, such as shower heads that conserve hot water, faucets that conserve hot water, bathtubs that retain heat and toilets that conserve water. This contributes to the creation of a pleasant lifestyle that takes both the environment and economy into account.

Rate of annual adoption for high-efficiency appliances
(hot water heaters/LED equipment/ultra-water-conserving toilets)

100/100/100% a year

(Note 1) KPI calculations are for newly built condominiums transferred en bloc in fiscal 2017 (with the exception of some properties from joint businesses, such as projects not managed by the company).

(Note 2) The adoption rate for LED devices is calculated including properties in which some shared spaces or dedicated spaces use LED devices.

Using ENE-FARM as a Standard Feature in All The Parkhouse Stage Houses

Mitsubishi Jisho Residence's The Parkhouse Stage series of detached houses have used ENE-FARM residential fuel cells as a standard feature*1 in all homes in the area supplied by Tokyo Gas from the design stage which began in November 2017.
ENE-FARM is a distributed energy system that is gentle on the global environment because it saves energy, cuts down on CO2 emissions and limits maximum power consumption. ENE-FARM produces electricity by causing hydrogen taken from municipal gas supplies to react with oxygen in the air. The electrical power generated is used by households and the heat generated in the process is used to supply hot water. Since the electricity is used in the same place where it is produced, there are no supply losses. The heat generated while making the energy is also used without any waste, so it is a highly environmentally-friendly system.
For properties in the Tokyo metropolitan area, ENE-FARM Resilience Models with continued power generating functions even during power outages*2 are used as standard. In the unlikely event of a power outage, this model provides electrical energy to power lights and communication devices through a custom outlet. Hot water and heating connected to ENE-FARM can be used as well. Furthermore, when there is a water outage or a disaster, water can be drawn from the hot water tank and used for non-drinking purposes.
To create homes that are kind to the global environment, the company will continue to actively encourage the adoption of environmentally-friendly home equipment and devices in the future as well.

*1 Excludes areas not served by Tokyo Gas.

*2 For ENE-FARM to produce energy during a power outage, ENE-FARM must already be producing electricity when the power outage occurs and the municipal gas and water utilities must still be supplied.

Image:CG rendition of expected exterior of The Parkhouse Stage Higashitotsuka homes using ENE-FARM for all homes when complete

CG rendition of expected exterior of The Parkhouse Stage Higashitotsuka homes using ENE-FARM for all homes when complete

Reductions in Heat Discharge, the Cause of the Heat Island Phenomenon

Marunouchi Heat Supply operates large-scale district cooling and heating systems, an energy system that protects the urban environment. At the company's plants, heat for heating and cooling use is produced and managed collectively, and supplied to the Otemachi, Marunouchi and Yurakucho area. By using district cooling and heating systems, air pollution can be prevented and CO2 emissions reduced compared to levels when each building is cooled and heated individually. In addition to saving energy, the system also reduces the amount of heat emitted to the atmosphere and thus helps mitigate the heat island phenomenon, a state in which the temperature in cities is higher than surrounding areas. We will continue to move ahead with initiatives like this to help conserve the environment.

Number of buildings using district heating and cooling, and their total floor space

115 buildings/About 7,429,000 m²

Comparison of environmental effect of district cooling and heating system and individual heat source method

Graph:Comparison of CO2 emissions

Currently, CO2 reductions achieved with district cooling and heating systems are equivalent to about 3,100 ha of forest. If this system is introduced to all companies in the area, the reductions would amount to about 4,200 ha, and the reductions would improve by 35%.

Environmentally Conscious Initiatives in New Condominiums to Create a Low-Carbon Society

In 2015, Soleco and Condominium Household Account Books, two initiatives undertaken by Mitsubishi Jisho Residence and MEC eco LIFE, won the Minister of the Environment's Commendation for Global Warming Prevention Activities, the first in the condominium industry, for the category of implementing and spreading the target activities. Soleco is the company's proprietary ecosystem that combines high-voltage collective power systems with solar panels while Condominium Household Account Books help residents keep track of utility costs and other running costs of owning a condominium.
The Mitsubishi Estate Group's housing businesses will continue to introduce Soleco and Condominium Household Account Books to contribute to the realization of a low-carbon society.

Photo:Receiving the commendation from Hiroshi Hiraguchi, then Senior Vice Minister of the Environment

Receiving the commendation from Hiroshi Hiraguchi, then Senior Vice Minister of the Environment

Environmentally-Conscious Proposals in the Design Supervision Business

To reduce the environmental impact of buildings throughout their life cycles, Mitsubishi Jisho Sekkei proposes various ways to incorporate environmentally-conscious technologies right from the planning stage.
Such proposals reinforce the company's drive to promote green technology, expand environmentally-related businesses and encourage the adoption of advanced environmental technology.
The company aims to accumulate more expertise on projects and the different technologies that fit the unique characteristics of each project through case studies so that it can proactively offer proposals that provide solid solutions to the requests of clients and the community.

Creating ZEB (Net Zero Energy Buildings) and improving their comfort

In addition to increasing energy-saving capabilities in the quest for Net Zero Energy Buildings, large-scale buildings are introducing a variety of environmentally-friendly technologies to create highly comfortable working environments focused on a variety of work styles and employee tastes.
These technologies have gone through new system development and reached the trial stage and have been installed in medium to small scale buildings for real-world verification. Through simulations and measurements, the new technologies enable the design of tenant office buildings with next-generation energy-saving abilities and comfort levels.

Environmentally-Conscious Technology Proposed by Mitsubishi Jisho Sekkei
  • Energy conservation technologies
    Natural lighting, natural ventilation, night-purge ventilation, latent/sensible heat separation air conditioning, radiant air conditioning, thermal storage systems, BEMS (Building Energy Management Systems), optimizing lighting/air conditioning systems, air flow windows, district heating and cooling, etc.
  • Technologies for saving resources and reducing waste
    Raw material recovery, reuse of rainwater, unitization of toilets, other resource-conservation technologies, waste disposal systems, etc.
  • Long life technologies
    Securing leeway and reinforcing buildings against earthquakes to ensure that buildings can be used for a long time.
  • Technology that promotes harmony between humans and nature and protects the environments
    Rooftop greening, wall greening, permeable pavement, biotopes, preservation of historic buildings, etc.

Click here for more details about environmentally-conscious initiatives (Japanese only)

Image: "Vital points of the environment," an Environmental Design Manual

"Vital points of the environment," an Environmental Design Manual

Akasaka Renovation Lab for Real-Time Experiences of Environmentally-Conscious Technology

Mitsubishi Estate Home opened the Akasaka Renovation Lab home research laboratory in July 2017 to check all deciding factors of renovated houses and rate them out of 100 points.
Akasaka Renovation Lab is a new kind of facility that lets people experience the "Before" and "After" versions of a house simultaneously. The first floor is the Before house, a model of a house built 30 years ago, while the second floor model shows the After house post-renovation. This makes it easy to picture the sense of design, functionality, comfort and also energy-saving capabilities of post-renovation houses. The Lab also serves as a facility for live experimentation with the environmentally-conscious technology used in the Mitsubishi Estate Group's residential business.
Furthermore, although conventional renovations tend to focus on designs and replacing equipment, at the Akasaka Renovation Lab, the focus is on invisible energy-saving measures like insulation and airtightness as well as safety measures like precautions against earthquakes. Based on this mindset, the Lab has established 10 categories to be considered during a renovation.
They offer renovation solutions that cover all these points in order to produce safe, comfortable homes.

Logo:Akasaka Renovation Lab

Image:Akasaka Renovation Lab

Online Distribution of "Home Renovation Building Check" Building Diagnosis Tool Begins

Mitsubishi Estate Home runs Mitsubishi Estate Reform, a renovation brand that draws on the comprehensive strengths of the Mitsubishi Estate Group.
From January 2018, it began to offer a new service under the Mitsubishi Estate Reform brand: the distribution a simple web-based building diagnosis tool known as the "Home Renovation Building Check."
The Home Renovation Building Check asks 29 questions in six categories (Interior/Exterior Decoration, Wet Areas, Earthquake Resistance, Insulation and Airtightness, Accessibility, Safety during Disasters) and then recommends renovations to carry out through a video after about five minutes.
It was originally a tool used in meetings with clients considering renovations, but the online distribution makes it possible for everyone to check their own houses easily.
Through the use of this tool, the company will be able to address the concerns and questions a greater number of clients have about renovations.

Photo:Home Renovation Building Check

Home Renovation Building Check

Effectively Using Existing Stock and Invigorating Communities with the Re-Building Business

Since May 2014, Mitsubishi Jisho Residence has been involved in the Re-building Business, where it renovates and rents older small- and medium-sized buildings. In 2017, the company finished the renovation of the ParkRex Hirakawa-cho, the largest project undertaken thus far. It opened in March with full occupancy.
The building, which was 43 years old when repair work was completed, has been seismically retrofitted. The renovation plan treated the simplicity of the building's bare skeleton frame as a main feature, yielding a stylish, pleasant space. IT companies and others that value originality are using this building. A wide variety of plants grow in the outdoor space on the first floor, where a sidewalk café is also located, two of many ways the building is helping to enrich the neighborhood.
The Re-building Business aims to complete 15 buildings in the five years beginning from 2014, covering a total rented floor space of 82,750 m². This business aims to address the social demand for effective use of existing structures, and multifaceted expansion is planned.
The company is also entering the condominium renovation business and has sold units in the Parkremore Shirokanedai Sanchome and the Parkremore Saitama Shintoshin.

Photo:Effectively Using Existing Stock and Invigorating Communities with the Rebuilding Business

Small- and medium-sized building renovations/condominium renovations

15 buildings/634 units

Manufacturing Environmentally-Friendly, Highly Durable Wall Panels with High Yield Strength

Mitsubishi Estate Housing Components manufactures highly durable, high yield strength wall panels with approximately 14 times the strength of conventional panels for use in four-story wooden structures built with the 2x4 method. The panels use Shinshu larch for 24 mm thickness structural plywood, which is not normally used for houses. They also use domestic Japanese hinoki cypress and Japanese cedar for laminated wood and laminated wall supports. Additionally, 54% of the building's frame is made from Japan-grown timber, helping revitalize the domestic forestry industry. Furthermore, the insides of the wall panels are able to secure the equivalent of 68 tons of CO2, making them environmentally-friendly wooden structures.

Photo:Construction using highly durable, high yield strength wall panels

Resolving Asbestos Issues in Existing Buildings

Mitsubishi Estate carries out a fact-finding investigation into the use of asbestos as building material and informs all tenants and service providers in the building of any asbestos use.
Based on laws, regulations and ordinances as well as the company's own Guidelines for Handling Asbestos in Existing Buildings, when repair work is being carried out, visual inspections and density measurements of the air environment are regularly performed to manage the risks of asbestos.
In fiscal 2017, visual inspections were performed on 12 of the company's buildings and preventive construction was done in two buildings. Through inspections and measurements, the company confirmed that all sections that use asbestos are currently stable.