Accounting and consulting firm RubinBrown is expanding to Nashville, where it will focus on Tennessee-based real estate clients. This will be the fourth city for RubinBrown, which is headquartered in St. Louis and has a location in Kansas City. “Nashville is a city that RubinBrown has been looking at for years,” managing partner John Herber said. “We recognize an increasing need for our specialized real estate services and, along with…