Utilization of Green Building Certification
- Policy for Acquiring Green Building Certification and Assessment
- CASBEE Assessment
- Top-Level Facility Certification
Green building certifications are granted by third parties regarding initiatives for the reduction of environmental load of buildings, improvement of comfort of users, etc. to assure high performance.
In an aim to increase the credibility and objectivity of its efforts to reduce environmental load as well as increase the value of its buildings in the mid-to-long-term, NBF endeavors to utilize green building certifications from third parties.
Policy for Acquiring Green Building Certification and Assessment
NBF aims to acquire 100% to acquire green building certifications and Assessment for existing properties under management on an ongoing basis for the purpose of reducing the environmental risks of its portfolio and increasing asset value in the mid-to-long-term.
Summary of Green Building certified properties in NBF’s portfolio (as of December 31, 2025)
| Rating | Number of Certified properties | Proportion of certified properties to whole portfolio (based on number of properties) | Total floor area of certified properties（㎡） | Proportion of certified properties to whole portfolio (based on floor area) | |
|---|---|---|---|---|---|
| CASBEE for Real Estate | S | 48 | 69.6% | 1,671,422 | 87.4% |
| A | 20 | 29.0% | 228,382 | 11.9% | |
| Total | 68 | 98.6% | 1,899,804 | 99.3% |
- Calculated based on the floor area multiplied by ownership ratio of the property or on the floor area of exclusively owned area.
- NBF Toranomon Bldg. (land with leasehold interest) is excluded from the calculation.
- As of the end of December 2025, Yokohama Mitsui Bldg. has obtained the “DBJ Green Building Certification,” Gate City Ohsaki has obtained “CASBEE for Buildings,” and D-TOWER TOYAMA has obtained a “BELS Certification.” In addition to these certifications, these properties have also acquired “CASBEE for Real Estate,” and the certification status table above is based on the acquisition status of CASBEE for Real Estate.
CASBEE for Real Estate
"CASBEE (Comprehensive Assessment System for Built Environment Efficiency)" is a system to evaluate
environmental performance of buildings, operated by the CASBEE Research Committee, established in April 2001
as an industrial/academic/government cooperation project under the support of the Housing Bureau of the
Ministry of Land, Infrastructure, Transport and Tourism. The system comprehensively evaluates the quality of
buildings, including but not limited to environmental considerations such as using materials and equipment
which are energy saving or have a lower environmental impact, internal amenities and also giving
consideration to views.
CASBEE for Real Estate is evaluated in four levels (from S rank to B rank).
- Frontier Musashikosugi N Bldg. and S Bldg. have each obtained separate CASBEE for Real Estate, with the N Bldg. receiving an “S” rating and the S Bldg. receiving an “A” rating. As the two buildings are treated as a single property in NBF’s portfolio, the above list presents the rating of the N Bldg. as representative.
Top-Level Facility Certification
The “Top-Level-Facility (Specified High Quality Commercial Facility with Measures against Global Warming)” is a scheme to proportionally mitigate the required greenhouse gas emission reduction ratio of the subject facility, in accordance with the level of measures taken against global warming, if such building is approved by the Tokyo Governor as meeting “certain standards set forth by the Governor” as an “office building promoting an excellent level of measures against global warming (Specified High Quality Commercial Facility with Measures against Global Warming).”
| Property Name | Certified Level |
|---|---|
| GranTokyo South Tower | Top-Level Facility |
| Shinjuku Mitsui Bldg. | Near-Top-Level Facility |
| IIDABASHI GRAND BLOOM | Near-Top-Level Facility |