Principal Associates is the southeast Michigan affiliate of TCN Worldwide, a consortium of independent commercial real estate firms, providing complete integrated real estate solutions locally and internationally. TCN-Worldwide is comprised of over 800 commercial real estate professionals serving mo... read morere than 200 markets worldwide. With approximately $31.9 billion in annual transactions and over 80 million square feet of space under management, the organization ranks as one of the largest service providers in the industry.