Return to ENERGY
Find More Facilities
ENERGY STAR Labeled Buildings & Plants
Facility Profile ENERGY STAR Logo

ENERGY STAR Labeled Building Profile

1125 Seventeenth Street
1125 17th Street
Denver, CO 80202
Map It!


1125 Seventeenth Street is committed to making system improvements that both conserve energy and reduce operating costs.


These improvements include extensive lighting retrofits that have significantly improved energy efficiency, while also providing better overall lighting. In 1999, the existing T-12 lighting system was retrofitted to a T-8 lighting system. The annual savings from this project have averaged more than $120,000 per year. In 2005, building management further improved energy efficiency and reduced costs by performing a building-wide retrofit of the existing F32 T-8 lamps to the lower wattage F28 T-8 lamps. This retrofit saved replacement labor hours and offered more consistent lighting throughout the building. The approximate annual savings are $8,700 with an initial $16,000 in Demand Side Management (DSM) rebate money. In 2009, the management team again performed a tower-wide lamp change-out and further reduced energy costs and consumption by decreasing wattage per lamp from 28 to 25 watts.

The management team also uses an Energy Management System (EMS) to control more than 800 points in the building's mechanical, heating, cooling, and lighting systems. This system has resulted in annual savings of more than $50,000. The system also enables extensive automated control to minimize heating loads and customize lighting, which maximizes energy savings during unoccupied times. In addition, the team has internet access to the property's EMS, enabling building personnel to easily check building operations remotely and make changes as needed.


To ensure timely preventative maintenance, the management team uses a Computerized Maintenance Management System (CMMS) to monitor all aspects of the tenant work order and preventive maintenance activities. This system was upgraded in 2007 to provide the team with a more comprehensive tool for managing work orders and preventive maintenance items, which enables them to provide more efficient tenant service with superior follow-up capability. The team can use the system to monitor equipment, record histories, log employee hours, and generate reports.

Additional energy efficiency improvements include:

-- An EV analysis software program provides the management team with a link to Xcel Energy for the purpose of monitoring the building's electrical energy consumption on a daily basis. This insight gives the team an opportunity to identify abnormal power use and acts as a troubleshooting tool in trying to understand when and why problems occurred.


-- A flat plate heat exchanger has been a valuable asset to the property since its inception in 1995. Aside from the tangible advantages, which include shorter chiller runtime resulting in longer equipment life and savings of approximately $35,000 per year, there is improved tenant comfort during the transition to mechanical cooling. Rather than run the chiller under a minimal load, it is particularly useful on moderate days when only some cooling is needed.

-- Variable Frequency Drives (VFDs) were installed on four 150-horsepower main supply fans and four 30-horsepower main return fans in 2004. Aside from the estimated $9,000 annual savings, the "soft start" capability is easier on the motors at start up, which is expected to result in longer equipment life. VFDs were also installed on the two cooling towers in 2003 and on the domestic water pumps in 2005. In addition, all four supply fans were replaced in 2005 and 2006 with fixed pitch fans and high efficiency VFD-rated motors, further optimizing energy efficiency.


-- The Carrier centrifugal chillers were re-tubed in 2007, using high-efficiency tubes in both the evaporator and condenser sections. At this time, the energy management team also took the initiative to convert from the existing R-12 refrigerant to the more environmentally friendly R134a. The team also included a gear conversion at this time to maintain, and actually increase, the efficiency and capacity of these machines.

In 2009, 1125 Seventeenth Street earned Silver designation under the U.S. Green Building Council's Leadership in Energy and Environmental Design (LEED) Existing Building: Operations and Maintenance Rating System.


1125 Seventeenth Street won the BOMA TOBY (The Office Building of the Year) Award in 1998 at the State and Regional levels. In 2004, it again won the BOMA TOBY Award at the State and Regional levels. The team entered this competition again in 2009, and won at the State level. 2009 Regional level is pending.


"The Management Team at 1125 Seventeenth Street feels it is important to utilize the amazing abilities offered by the ever-expanding technological world we live in."

-- Frank Connolly, Chief Engineer, Transwestern

Please note: Narrative information in this profile has been provided by 1125 Seventeenth Street, LLC 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:*
1125 Seventeenth Street, LLC

Property Manager:*

Year(s) Labeled (Rating):
2002 (75)
2003 (80)
2004 (80)
2005 (79)
2006 (82)
2007 (94)
2008 (96)
2009 (95)
2010 (93)
2011 (95)
2012 (97)
2013 (90)
2014 (93)
2015 (93)
2016 (93)
2017 (94)

Facility Type: Office

Total Floorspace: 526766.3 sf

Year Constructed: 1980

Contract Type: None

Technologies Used:
   Stage 1-Recommissioning
   Stage 2-Lighting
   Stage 3-Load Reductions
   Stage 5-Heating and Cooling Plant