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Kettler Welcomes First Tenants to Prince William County Center Office

Berkley Net Underwriters, LLC's Headquarters to Occupy Over 6,500 Square Feet

January 18, 2007

Kettler, one of the Washington area’s leaders in diversified real estate development and property management, has announced, Berkley Net Underwriters, LLC, a subsidiary of W. R. Berkley Corporation, as the first tenants to occupy the first of two new class-A office buildings at Prince William County Center.

"We are excited to have Berkley Net Underwriters, LLC as the first tenants and we hope this is the beginning of a long relationship with one of the insurance industry's premier companies," said James Nobil of Kettler.

Berkley Net Underwriters, LLC's new headquarters will be on the second floor of the 59,910 square foot building, located on Prince William Parkway, directly across from the McCort Building, headquarters of the Prince William County Government. The move is scheduled for spring 2007.

"The Prince William County Center offers a great location for us to grow. Our customers and employees will appreciate the convenience and amenities our space will provide,” said John Goldwater, President and CEO of Berkley Net Underwriters.

Prince William County Center is comprised of 1,000 mixed residential homes, which are currently sold out, and mixed-use retail and office buildings. There are plans for a second office building to be constructed at a later date.

About Kettler

Based in Northern Virginia, Kettler (formerly known as KSI) is a leading developer of award-winning, mixed-use residential and commercial properties across the Washington Metropolitan area. In 2006, Kettler was named one of the area’s largest private companies by the Washington Business Journal and is one of the nation’s top 15 multifamily developers. Kettler has developed more than five million square feet of commercial space and more than 50,000 homes. Current projects include urban and transit-oriented developments, multifamily housing, commercial and mixed-use developments and resort communities. Robert C. Kettler, a third-generation builder and developer, founded Kettler in 1977. Further details may be found on the web at www.ksi.com

About W. R. Berkley Corporation

Founded in 1967, W. R. Berkley Corporation is an insurance holding company that is among the largest commercial lines writers in the United States and operates in five segments of the property casualty insurance business: specialty insurance, regional property casualty insurance, alternative markets, reinsurance, and international. For more information on Berkley Net Underwriters, please visit www.berkleynet.com.