WASHINGTON — Blake Robison, producing artistic director of the Round House Theater in Bethesda, Md., for the past 7 years, will ankle the post in June to become honcho of the Cincinnati Playhouse in the Park. The move ends a broad search by the Cincy org for a successor to longtime a.d. Edward Stern that included more than 100 applicants.Robison said he is sad to leave Round House, but relishes the opportunity to work at the flagship theater. “I will be looking for opportunities to broaden programming, offer more plays for family audiences and develop an alternative series for younger patrons,” he said. In the meantime, he’ll be busy planning the upcoming seasons of both facilities. Robison’s artistic stamp at Round House has been his sharp focus on staged adaptations of novels in a series called the Literary Works Project. They included commissioned remakes of “The Talented Mr. Ripley,” “How the Garcia Girls Lost Their Accents” and “The Picture of Dorian Gray.” The approach helped Round House carve a niche in the crowded D.C. theater market while improving the company’s financial stability, said Robison. Round House has appointed a search committee for Robison’s successor.