Core Viewpoint - The appeal of duplex apartments is diminishing due to high costs, unsatisfactory living experiences, and low liquidity, making them less ideal for middle-class families [1][5]. Group 1: High Costs - The renovation of duplex apartments is significantly more complex and expensive compared to regular homes, with costs for a 150 square meter duplex often reaching 600,000 to 700,000 yuan or more [1][3]. - Ongoing costs such as property fees, maintenance funds, and heating expenses further increase the financial burden on owners, surpassing that of ordinary residences [1]. Group 2: Living Experience - Many owners find that the actual living experience in duplex apartments does not meet their initial expectations, with issues such as poor lighting and ventilation due to the design [3]. - The design of stairs in duplex apartments often poses safety risks for children and the elderly, as they tend to be steep or narrow, which can lead to accidents [3]. Group 3: Investment Risks - The secondary market for duplex apartments is underperforming, with limited appreciation potential and difficulties in selling [3]. - The ambiguity between duplexes and villas leads high-net-worth individuals to prefer standalone villas, while middle-income families are deterred by the high total price, resulting in a "buy easy, sell hard" scenario for duplex owners [3][5].