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ENERGY STAR Labeled Building Profile

6710 Rockledge Drive
6710 Rockledge Drive
Bethesda, MD 20817
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Owned by TIAA and managed by Transwestern. Capital Gateway II is a five-story, 295,000-square-foot office building in North Bethesda's Rock Spring Park office campus. The unique design of Capital Gateway II, by I.M. Pei & Partners, includes two wings, connected by a curving radius wall, with an enclosed oblong courtyard. In addition to the courtyard and the landscaped campus setting, tenants enjoy the convenience of a two-story underground parking structure. Capital Gateway II was completed in 1993.

Capital Gateway II earned the ENERGY STAR for superior energy performance as a result of extensive retrofitting and highly proactive energy saving strategies by building management. Completed lighting-related retrofits include installing T-8 bulbs with electronic ballasts throughout and installing occupancy sensor light controls in all building spaces. HVAC systems were also retrofitted for greater efficiency, including by using variable frequency drives (VFDs) on condenser water pumps and cooling tower fan motors and using cooling coils that have the ability to free-cool and mechanically cool simultaneously. Finally, VFDs were installed on the domestic water pumps.

On the management side, property managers at Capital Gateway II use a computerized building management system (BMS) to continuously monitor building energy consumption, and they enact load shedding measures when consumption peaks. They also work with tenants to help ensure the use of blinds to reduce thermal gain from sunlight.

In January 2008, a high efficiency sand filter system was installed to reduce the particle size in the condenser water system. This, coupled with an ultraviolet (UV) light system has reduced the property's chemical usage, further preserving local waterways. It has also improved water quality, which has resulted in a significant reduction in energy consumption of the building's HVAC system.

In 2009, VFDs where installed on the outside air fans along with rebalancing to further reduce the energy usage.

Transwestern, an EPA ENERGY STAR Partner of the Year in 2003, 2004, 2006, 2007, and 2009, as well as the recipient of the EPA's Sustained Excellence in Energy Management award in 2006, 2007, 2008, and 2009, is proud to participate in the ENERGY STAR program, considering it an aid to leasing and a sound and responsible business decision.





Please note: Narrative information in this profile has been provided by TIAA or a representative of this facility. Other building information was verified and submitted to EPA at the time of application. Building energy performance, operating characteristics, and ownership/management may be subject to change over time.

Building Owner:*

Property Manager:*
Transwestern Commercial Services

Year(s) Labeled (Rating):
2002 (81)
2003 (83)
2004 (89)
2006 (75)
2007 (93)
2009 (80)
2010 (91)

Facility Type: Office

Total Floorspace: 300390 sf

Year Constructed: 1993

Contract Type: None

Technologies Used:
   Stage 2-Lighting