BY STEVE LACKMEYER Business Writer slackmeyer@Oklahoman.comAckerman McQueen, the city's oldest advertising, marketing and media company, is set to leave its home of 30 years at Valiance Tower later this year and will anchor the Monarch Building being built in Midtown.The company also has offices in Dallas, Washington, D.C., and Colorado Springs, Colorado, with 125 of its 190 employees based in Oklahoma City.Read more on NewsOK.com