Zone Mechanical is in the HVAC zone. The company offers heating, air-conditioning, refrigeration, and other services to customers in the Chicago area and in northwestern Indiana on a 24-hour-a-day basis. The company, which was formed in 2001, distributes, installs, and services products manufactured by Tyler Refrigeration Corporation and other companies. In 2004 Zone Mechanical ranked 57th in Entrepreneur magazine's "Hot 100" list of the fastest-growing new entrepreneurial businesses in America. The firm is owned by co-presidents Dan Palubiak and Frank Petrosino.

SBLM Architects provides architectural services for commercial/residential, educational, government, restoration, and retail/entertainment projects. The firm also has an interiors group that supplements its five specialty areas. Clients include Hofstra University, AnnTaylor, West New York Public Library, and Rockefeller Center, Inc. SBLM Architects operates from offices in New York and Miami and an international office in Dublin.

Kleinknecht Electric Company (KEC) offers electrical construction and electrical, data, and telecommunications installation and maintenance services in the metropolitan New York City area. The company has two divisions (maintenance and datacom) and specializes in high-rise data infrastructure and landmark building renovation projects. KEC has completed projects in office buildings, broadcast facilities, museums, concert halls, and manufacturing facilities. The family-owned company, which was founded by George Kleinknecht in 1916, is one of the largest electrical contractors in the US.

End Systems knows absolutely no end in providing a variety of services in HVAC and electrical contracting. The company primarily manages, documents, and tests the work of installers. Included among these services are creating computer-generated fitted drawings for building services and testing buildings for air tightness and water treatment. End Systems also provides energy log books to building managers to document their property energy requirements. Clients have included Bovis, AstraZeneca, and Amec. Managing director Brian Townsend started the company in 1976.

C. Overaa & Co. has been making its mark in Northern California. Norwegian immigrant and carpenter Carl Overaa founded the company in 1907 in order to help rebuild San Francisco after a major earthquake struck. Today the family-owned company builds institutional, commercial, industrial, public, and housing projects primarily in San Francisco's East Bay. It provides preconstruction, design/build, construction, sustainable building, and contracting services. The company's customers have included Courtyard by Marriott, the John Muir Medical Center, the US Postal Service, YMCA, and the University of California, Berkeley.

Southeastern Metals has grown into one of the region’s leading manufacturers of metal building products. In 1997, Gibraltar Industries acquired the company, uniting the quality product line of Southeastern Metals with the nationally respected brand name of Gibraltar. As a member of the Gibraltar Industries family, Southeastern Metals is part of a billion dollar network of manufacturers expanding across the globe. With the support and backing of Gibraltar, Southeastern Metals will remain the name you can trust for quality metal building products.

Amarr was founded in 1951 by brothers Abe, Morris, and Herb Brenner and is owned by the Brenner family. This company is really into garage sales. Amarr designs, manufactures, and distributes garage doors for residential and commercial customers. Residential doors are made from steel, wood, aluminum, and wood composite; commercial doors come in aluminum, glass, or steel. Other products include garage door openers, screen doors, and vinyl garage flooring. The company offers door brands such as JELD-WEN, LiftMaster, Dynasty, and Linear. Amarr has 70 distribution centers in the US, Canada, Mexico, and Hungary, and its products are sold to dealers and major retailers such as Sears, Lowe's, Sams Club, and Costco.

Keller Group is killer when it comes to foundation work. The international ground engineering company specializes in concrete reinforcement, ground improvement, specialty grouting, and structural repair. Keller operates in more than 30 countries worldwide, with a focus on the European, Australian, and North American markets. However, it also has a growing presence in the Middle East and Asia. Keller works on infrastructure, commercial, industrial, and residential projects. The company designs and builds most of the specialist equipment used by its business units. About 45% of Keller's revenues come from North America, where the group operates Hayward Baker, Suncoast, Anderson, Case, and McKinney Drilling.

Colson & Colson is the general contractor so good they named it twice. The company develops, builds, and operates retirement communities throughout the US, Canada, and the UK. It has built or managed more than 300 retirement communities since it was founded in 1963. Colson & Colson primarily develops properties for former affiliate Holiday Retirement (HRC), the #1 owner and manager of retirement homes in the US and Canada. It provides site selection, rezoning, construction, and finance services. Prior to focusing exclusively on retirement facilities, Colson & Colson developed single-family residential, commercial, and retail properties as well. The Colson family owns the majority of Colson & Colson.

Construction Specialties, a member of the global C/S Group of companies, makes specialty architectural products for the new construction market including sunscreens (louvers and grilles) and entrance carpeting. Its Acrovyn line of wall panels, doors, and protection products include accent rails, corner guards, and handrails. The company also makes specialty venting products (such as explosion vents) and track and curtain systems. Its goods are featured in projects ranging from the the skyscraper Taipei 101 to the new Dallas Cowboys football stadium.

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