Sheera Berkowitz, Robert Kluge and Casey Lewis have joined NAI Global as associates. NAI Global is a network of commercial real estate firms and one of the largest real estate service providers worldwide. Berkowitz is an associate on NAI Global's corporate services team. Berkowitz is working with Henry Goodfriend, managing director on a broad range of client initiatives. Lewis, also an associate, specializes in office leasing and tenant representation He is experienced in representation of a diverse range of corporate clients, including financing services, advertising, media, technology and health-care firms. Kluge comes to NAI Global as an associate specializing in in office leasing, with a focus on financial institutions. He joins an experienced team led by managing director Andrew Simon, an industry veteran with over 28 years of experience.