ABM Installs One of the Largest Solar Arrays in Baltimore History

ABM Partners with Sol Systems and Washington Gas Energy Systems on 1.2 MW Solar Array

New York, NY - December 5, 2013 - ABM (NYSE:ABM), a leading provider of

facility solutions, announced today that ABM's energy business has
successfully commissioned a 1.2 MW solar array in Baltimore, Md.,
representing one of the largest solar installations to date in the Baltimore
metropolitan area. Washington Gas Energy Systems, a subsidiary of WGL
Holdings (NYSE: WGL), owns the system, and land owner Glen Meadows
Retirement Community, a subsidiary of Presbyterian Senior Living, will reap
the benefits of lower, fixed-rate energy costs. ABM provided the
engineering, procurement, construction and commissioning of the solar array
on behalf of Washington Gas Energy Systems and Sol Systems, which provided
the solar financing for the project.

In addition to being responsible for construction, ABM will also maintain
the 4,150 panel array on behalf of Washington Gas Energy Systems under a
long-term contract, providing the senior living facility with fixed,
low-cost energy rates over the life of the 20-year agreement, allowing
Presbyterian Senior Living to save money as utility costs are expected to
rise in the coming years. The system is expected to generate just over 1.5
million kilowatt hours (kWh) per year. Construction began in August and was
finalized in October.

"ABM is excited to have completed the first of many utility-scale solar
development projects to come," said Ted O'Shea, ABM energy business vice
president. "We've made significant investments to increase our expertise in
the development of renewable energy as a solution to reduce owning and
operating costs and increase energy efficiency for our clients. We look
forward to continuing to help other organizations obtain fixed-cost energy
pricing while generating revenue for their facilities through our renewable
energy solutions."

The multi-year, multi-million dollar contract represents the first project
completed through ABM's recent joint venture with Building Energy, an
Italian-based independent power producer, which added further expertise to
ABM's renewables team. ABM and Building Energy have collectively installed
over 250 MWs through solar engineering, procurement and construction (EPC)
contracts, completed over $1B in energy projects, and currently operate and
maintain over 200 MWs of solar facilities across five countries.

"Our joint venture with ABM delivered a high quality solar plant within a
short timeframe, ensuring Washington Gas Energy Systems' standards were met
across the project's execution," said Andrea Braccialarghe, Building
Energy's managing director, America. "Building Energy's solar power plant
experience worldwide creates tremendous value for our joint venture's U.S.
clients through well-built systems that maximize clean, renewable solar
power."

ABOUT ABM

ABM (NYSE: ABM) is a leading provider of facility solutions with revenues
exceeding $4 billion and 100,000 employees in over 350 offices deployed
throughout the United States and various international locations. ABM's
comprehensive capabilities include facilities engineering, commercial
cleaning, energy solutions, HVAC, electrical, landscaping, parking and
security, provided through stand-alone or integrated solutions. ABM
provides custom facility solutions in urban, suburban and rural areas to
properties of all sizes - from schools and hospitals to the largest and most
complex facilities, such as manufacturing plants and major airports. ABM
Industries Incorporated, which operates through its subsidiaries, was
founded in 1909. For more information, visit www.abm.com.

ABOUT BUILDING ENERGY

Building Energy is an independent producer of energy from renewable sources
with a large portfolio of renewable plants in operation, construction and
development, with a total pipeline in excess of 800MW in Europe, Africa,
Central and North America. In South Africa, Building Energy won the contract
for the biggest photovoltaic project on the African continent - 81 MW in
Kathu - in the first round of the REIPP, the South African government's
incentive program for the production of renewable energy. The power station
is currently under construction and is expected to be in operation by August
2014. For more information, visit buildingenergy.it.

ABOUT GLEN MEADOWS RETIREMENT COMMUNITY

Glen Meadows is a subsidiary of Presbyterian Senior Living, a not-for-profit
organization, providing retirement and senior care services for more than 85
years. Headquartered in Dillsburg, Pennsylvania, Presbyterian Senior Living
provides services to approximately 6,000 seniors in 29 locations in the
mid-Atlantic region of Pennsylvania, Maryland, Ohio and Delaware.
Presbyterian Senior Living fulfills its charitable purpose and mission by
providing a full range of high-quality healthcare, housing, and other
related community services directed primarily to people 55 and over. For
more information, please visit presbyterianseniorliving.org or
glenmeadows.org

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