门头沟16个老旧小区改造完成，惠及3585户居民

Group 1 - The core viewpoint of the article highlights the successful completion of the renovation of 16 old residential communities in the Mentougou District, benefiting 3,585 households who will celebrate the upcoming Spring Festival in improved living conditions [1] - The renovation project involved 57 old residential buildings with a total area of 295,000 square meters, with the largest community being the Deluyuan community [1] - The project faced challenges such as narrow construction sites, safety requirements near high-voltage lines, and the need for coordination due to commercial shops on the ground floors [1] Group 2 - To minimize disruption to residents, the construction schedule was strictly limited, with further reductions during holidays [2] - A resident reception room and a hotline were established to address residents' concerns, with a daily issue log maintained to ensure prompt resolution of problems [2]