The District has chosen a developer to rebuild the Tenleytown library beneath a towering 130-unit apartment building, sparking a backlash from neighbors who dread increases in traffic, loss of green space and delays in library construction.

Mayor Adrian Fenty announced the partnership with Berwyn, Pa.-based LCOR Inc. during a news conference Thursday at the intersection of Wisconsin Avenue and Albemarle Street, encircled by protesters calling him a “sellout” and shouting, “We don’t want this.”