BUILDING AT A GLANCE
Name YKK 80 Building
Owner YKK REAL ESTATE CO., LTD.
Principal Use Headquarters office building
Expected (Design) Occupancy 600
Percent Occupied 100%
Gross Square Footage 225,170
Conditioned Space 158,000
Distinctions/Awards 2017 ASHRAE
Technology Awards First Place; LEED C&S
Total Cost $100,558,710
Cost per Square Foot $447
Substantial Completion/Occupancy 2015
ENERGY AT A GLANCE (JAPAN)
Annual Energy Use Intensity (EUI) (Site)
33. 24 kBtu/ft2
Electricity (Grid Purchase) 28.53 kBtu/ft2
Natural Gas 4.71 kBtu/ft2
Annual Source (Primary) Energy 82.08 kBtu/ft2
Savings vs. Standard 90.1-2007 Design
ENERGY STAR Rating BELS in Japan: five star
Annual Hours Occupied normal
weekday × 9 hr/day, some weekends
(Saturday) × 9 hr/day
WATER AT A GLANCE
Annual Water Use
2,553,000 gallons per year; clean water
1,592,000 gallons; graywater 788,000 gallons, which is 100% recycled water
KEY SUSTAINABLE FEATURES
Rainwater collection, treated wastewater,
water saving appliances, recycled water used
for toilet flushing and landscaping.
Concrete with high-percent recycled material,
wood products with 10% recycled materials.
Construction materials sorted and collected
for recycling. Use of local and native materials. Low-emission interior finishes.
Sudare screen and clear double glazing with
automatically controlled climbing blinds.
Task lighting for all workstations, air conditioning controls every 200 ft2 to 300 ft2.
Carbon Reduction Strategies
Energy-efficient strategies throughout.
Transportation Mitigation Strategies
Five-minute walk from railway station.
Other Major Sustainable Features
Task and ambient lighting, water-saving
system for toilet and heat recycling for air-
conditioning system, green roof to cool the
air around the air-conditioning unit. The
building features a thermal air-intake system,
a green rooftop garden with farm-to-table
food production, ongoing measurement and
monthly verification, periodic post-occupancy
evaluations, and MERV 13 filtration for PM2.5
Type Concrete roof with roof garden
Type Concrete 140 lb (R-0.132 h·ft2·ºF/Btu)
8 in. HW concrete + R- 11 wood furred
Effective U-factor for Assembly 30. 1 W/ft2·K
Solar Heat Gain Coefficient (SHGC) 0.14
Visual Transmittance 53%
Latitude 35.652832 139.839478
35° 39' 10.1952'' N
and 139° 50' 22.1208'' E
Orientation The longer axis of the site
is 230 ft in length, facing westward, and
overlooks a metropolitan expressway. This
caused several energy, daylight, noise, and
view design challenges for the hot and humid
summer climate of Tokyo.
YKK REAL ESTATE CO., LTD.
Architect/Engineer NIKKEN Sekkei LTD.
CASE STUDY YKK HEADQUARTERS
of the façade is
as you walk around