A few years back, developers had an idea: Take a piece of land south of the 10 freeway that was occupied by a radio station cluster, and build a 30-story, fancy glass residential tower. The building, known as the ARQ, is part of a full development with restaurants and a Whole Foods near the intersection of La Cienega and Jefferson. But that fancy part — and the political part in getting it done — are sticking in the craw of a lot of folks in that part of South LA.