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Ninth Street Capital Partners has closed its investment in Interior Building Systems, a Manassas, Va.-based commercial millwork manufacturer.

NSCP will integrate IBS, which serves the Washington D.C. Metropolitan area and the greater Mid-Atlantic region, into its family of millwork companies, which operate under parent company USA Millwork. Terms were not disclosed.

“IBS is known throughout the region as the company to call when you have a tough job that has to be 100 percent right,” NSCP Managing Partner Michael Weiner said in a statement. “With over 20 years of experience serving the Mid-Atlantic region, IBS brings a strong track record of leadership in commercial millwork. The management team is led by the company’s founder, Paul Bell, who shares our vision for a customer service-oriented concept-to-completion manufacturer that provides finely crafted products.”

McDonald Hopkins provided legal counsel on the transaction. Flagstar Bank and Tecum Capital Partners provided financing.