General Directions To 1947 Main St Nw, Atlanta, Ga 30318 (Using Interstates): From I-75/I-85 (Downtown Connector): Take I-75 North Toward Marietta, Then Exit Onto Howell Mill Rd (Exit 252). Turn Left Onto Howell Mill Rd, Then Right Onto Chattahoochee Ave Nw. Follow To Marietta Blvd Nw, Turn Left