(RECAP: Four Arlington County-owned sites are already in the planning stages to be developed into affordable housing. The sites — Rosslyn Highlands Park/Fire Station 10; Courthouse Square and Plaza; land adjacent to Lee Gardens; and Gables North Rolfe Street — were introduced by County Manager Barbara Donnellan yesterday when she presented her proposed 2015-2024 Capital Improvement Plan to the County Board. Four other sites are considered “Tier 2″ potential places for affordable housing — they are not in the CIP for redevelopment but have been identified as areas where affordable housing development could be feasible.)