Welcome To TDGcorp. TDGcorp is a boutique Real Estate development firm specializing in upscale lifestyle retail shopping centers and urban infill projects for our own portfolio and on a fee basis. Founded in 2007 by Brett Thornton, the company was formed with an entrepreneurial spirit to create projects that improve neighborhoods, bring a sense of community and instill a family spirit to traditional retail environments. TDGcorp also offers a wide variety of third party development and management services.