Global Real Estate Development Content on this page requires a newer version of Adobe Flash Player. Combining Strategic Vision with Sound Execution J. J. Gumberg Co. is a third-generation, global real estate investment and development company. Headquartered in the United States (Pittsburgh, Pa.), Gumberg has been an established industry leader for nearly 90 years, and is one of the largest privately held retail real estate developers in the country. Gumberg is focused on creating institutional-quality, large-scale retail properties and is distinguished for taking innovative approaches to an evolving industry, such as analyzing and understanding demographic shifts, emerging trends in lifestyle and purchasing behaviors as well as commercial attitudes. The company’s strategic thinking, combined with sound execution, contribute to its enduring success.