Core Viewpoint - The once-desirable large flat apartments are now facing a decline in popularity due to significant financial burdens and changing living preferences among middle-class families [1]. Summary by Categories Renovation Costs - Many middle-class families face overwhelming financial pressure during the renovation phase of large flats, with costs for a 200-300 square meter apartment exceeding 500,000 yuan for basic renovations and an additional 200,000 yuan for furniture and appliances [4]. High Property and Living Costs - Large flats are typically located in mid to high-end communities, leading to high annual expenses such as property management and heating fees, which can amount to tens of thousands of yuan, making it difficult for families to sustain these ongoing costs [5][7]. Living Experience - The spaciousness of large flats, often exceeding 180 square meters, can lead to a sense of emptiness and loneliness for smaller families, prompting many to seek more compact and cozy living spaces [9]. Market Liquidity - The market liquidity for large flats is poor, with properties often exceeding 250 square meters priced at over 20,000 yuan per square meter, resulting in total prices above 5 million yuan in second-tier cities and easily surpassing 10 million yuan in first-tier cities, making it challenging for ordinary middle-class families to find buyers when they need to sell [9].