In the 1970s, landlords used to handle their own office build-outs, and they worked directly with many smaller contractors like P.J. They worked with nearly every landlord in NYC doing the office buildouts for their tenants. During this time, Peter Pappas Sr. founded Delta Sheet Metal to support the sheet metal fabrication needs of his clients. But things were about to change. Corporate consolidation in the 1980s and 1990s brought massive tenant projects that unfortunately left out most small contractors due to their size. P.J. stepped up to fill this new void, tackling some of the largest tenant projects in the city, such as Conde Nast, American Express, and Deutsche Bank. No other contractor could handle the large consolidations, and P.J. quickly became the go-to tenant contractor. During this time, Peter founded Expert Insulation to provide thermal insulation for sheet metal, ductwork, pumps, and piping applications to reduce leakage and energy waste. As the needs of the clients grew, P.J. kept expanding to meet them.
In the early 2000s, P.J. Mechanical took a giant leap of faith, this time working directly with the developers to build the core and shell of the building from the ground up, then performing their tenant interiors and the secondary amenities packages. P.J. was called upon for significant renovations at signature properties such as the Chrysler Building, Citicorp Building, Madison Square Garden, Yankee Stadium, the United Nations, AOL Time Warner Center, G.M. Building, Park Avenue Atrium, NYU Medical Center, Weil Cornell Medical Center, Carnegie Hall, Carnegie Tower, and Morgan Stanley Properties. But their proudest moment came in 2005 when P.J. Mechanical was selected to work on the new World Trade Center Project at Ground Zero and the 9/11 Memorial and Museum.