GDA REAL ESTATE SERVICES, LLC GDA Real Estate Services, LLC has been in the commercial real estate business since 1993. GDA has been involved in over 270 shopping center transactions in 15 states. GDA actively administrates leasing for over 80 properties totaling approximately 8 million square feet within Arizona, California, Colorado, Georgia, Illinois, Tennessee, Kansas, Louisiana, Minnesota, Missouri, New Hampshire, Ohio, Texas, Virginia and Washington. GDA has overseen all aspects of real estate ownership and management, including, acquisition, disposition, finance, development, construction, leasing and management.