GREEN FEATURES
733 10th and G is pursuing LEED Gold Certification under the LEED Green Building Rating System™. LEED is the nationally accepted benchmark for the design, construction and operation of high-performance green buildings and is a trademark of the U.S. Green Building Council. The project is using the Core and Shell 2.0 rating system.
The project is designed to be Environmental Protection Agency (EPA) ENERGYSTAR rated and to be operated using the EPA Portfolio Manager energy management tool.
Sustainable Site
- Sprawl Reduction
Redeveloping an existing urban site creates and maintains a dense, mixed-use environment. This improves access to transportation, infrastructure and services, and leads to reduced energy consumption associated with commuting and Greenfield development.
- Alternative Transportation
- Within one block of all five Metro lines, the Circulator bus and NYC bus shuttles
- Vibrant location near restaurants and retail
- Secure bicycle storage.
- Preferred parking for hybrid vehicles in parking garage
- Proposed parking space on street for Zipcar car-share spot
- Stormwater Design
A vegetated green roof captures stormwater and allows it to slowly filter into the city’s combined storm and sewer drains. This reduces stormwater overflow events that send polluted water into the Anacostia and Potomac rivers.
- Urban Heat Island Prevention
The urban heat island effect raises the city’s temperature above that of the surrounding undeveloped areas, threatening human comfort and wildlife habitat. The roofing paver for the roof deck will both release absorbed heat and reflect solar radiation. A black roof has a Solar Reflectance Index of 0 out of 100. The specified roof paver for this development will have a Solar Reflectance Index of 87.
- Light Pollution Reduction
Automatic timers will switch off non-emergency interior and exterior lighting after 11 p.m. to improve nighttime visibility and reduce impact on nocturnal wildlife
Water Efficiency
- Water-efficient Landscaping
The vegetated roof features drought-resistant plants that can survive on natural rainfall after implementation
- Water Use Reduction
Efficient plumbing fixtures for toilets, sinks and showers reduce the amount of wastewater generated per use Waterless urinals provide savings of 0.5 gallons per flush
Energy and Atmosphere
- Building Operation
This facility is expected to save¹
- Approximately 420,000 kWh annually
- A coincident peak demand of 310 kW (winter)
- Approximately $50,000/year in annual energy expenditures
- Approximately 35ยข/SF (12%) in annual tenant operating expenses
- Annual Emissions Reduction
574 tons of CO2 in annual emissions in the District of Columbia. This reduction will equate to any of the following
- 95 passenger cars off the road each year
- 59,100 gallons of gasoline saved each year
- 70 households’ full electrical load for a year
- 21,700 propane cylinders used for home barbecues each year
- 180 tons of waste recycled instead of land filled each year
- Building Design Features
Improved envelope performance
- High-performance glass with a low solar heat gain coefficient of 0.23. The lower the coefficient, measured between 0 and 1, the less solar heat load transmitted into the building.
- The project takes advantage of building adjacencies in a dense urban setting to reduce directly transmitted solar loads
- Premium efficiency unitized curtain wall system is thermally broken aluminum with continuous thermal isolators. The unitized system reduces the dependence on field weather seals.
- Energy-efficient low-wattage T8 garage lighting with integrated occupancy sensors and 30-minute delay after business hours
- Improved common area lighting power densities (~8% improvement)
- High-performance, water-cooled direct expansion (DX) units with multiple compressors for improved part-load performance
- Waterside economizer coils for self-contained units with isolation valves and full-condensing water reset
- Variable speed drives on cooling tower fans
- Premium performance pumps with variable speed drives
- Penthouse roof is designed to be “renewable ready”
Materials and Resources
- Construction Waste Management
75% or more of construction waste diverted from the landfill 160 tons of carpet and metals from the previous building were recycled
Several items from the previous structure were salvaged, including crepe myrtle trees, church pews and stained glass windows
- Recycled Content
Concrete aggregate will include materials such as slag and fly ash to save energy and reduce waste
Indoor Environmental Quality
- Increased Ventilation
Demand control ventilation with carbon dioxide sensors in the return air stream measure and provide actual amount of fresh outdoor air needed for actual occupant load, reducing energy used to operate circulation fans
Carbon monoxide garage ventilation control
- Low-emitting Materials
Adhesives, sealants, paints, and other coatings do not exceed VOC (volatile organic compound) limits
- Daylight and Views
The building’s six-sided glass structure allows daylight to enter from all sides. The floor plate design offers maximum flexibility to provide optimized daylight and views to all tenants.
