Who is main street realty? Main Street Realty, Inc., is an award-winning full service real estate development company. Our primary mission is to provide quality management, development and construction services in all real estate ventures.How do i contact main street inc? Contact Main Street Inc. at 205.380.4000 or send us an email. We will get back with you promptly.Why choose mainstreet realtors of southern indiana? The Mainstreet Realtors team take full advantage of the marketing resources and support we have at our disposal first and foremost by belonging to 3 different Multiple Listings Services throughout Southern Indiana. It is a huge advantage to be able to market and search for homes in that many counties.