“The owner of Broadway’s third largest theater chain is looking for a partner. Rocco Landesman, the colorful Broadway producer who bought Jujamcyn Theaters last year for $30 million, is trying to sell a 50 percent stake in the company for about $50 million.” But Landesman, who is pursuing some of Broadway’s richest financiers for the partnership, could get more than he bargained for, given Broadway’s long history of political and financial squabbles.