Recent data indicates a significant decline in housing affordability across the United States, precipitating a shift in residential patterns and necessitating legislative intervention.

近期數據顯示，全美國的住房負擔能力顯著下降，導致居住模式轉移，並使得立法干預成為必要。

The 2026 State of the Nation's Housing report, issued by Harvard University's Joint Center for Housing Studies, delineates a comprehensive increase in the cost of residential maintenance. Between 2019 and 2025, average property taxes escalated by 31%, while monthly insurance premiums experienced a 72% increase. These fiscal pressures, compounded by persistent inflation and elevated mortgage rates, have resulted in a historic nadir in residential mobility, with only 11.2% of households relocating in 2024.

由哈佛大學住房研究聯合中心發布的《2026年國家住房狀況報告》詳細列出住宅維護成本全面上升。在2019年至2025年之間，平均房產稅上升了31%，而每月保險費則增加了72%。這些財務壓力，加上持續的通貨膨脹和高房貸利率，導致住宅流動性跌至歷史最低點，2024年僅有11.2%的住戶搬遷。

Rental markets exhibit similar instability. Approximately 50% of renter households allocated at least 30% of their income to housing in 2024, with 26% exceeding a 50% allocation. This burden is most acute among low-income cohorts, where 83% of renters earning under $30,000 annually are classified as cost-burdened. Despite post-pandemic increases in construction, high development costs have rendered new inventory inaccessible to low- and middle-income demographics. This discrepancy is evidenced by the 127,000 unsold homes recorded in January 2026, the highest volume since 2009.

租賃市場同樣表現出不穩定性。2024年約有50%的租房住戶將至少30%的收入用於住房，其中26%的比例甚至超過50%。這種負擔在低收入群體中最为嚴重，年收入低於3萬美元的租客中，有83%被歸類為負擔沉重。儘管疫情後興建量有所增加，但高昂的開發成本使得低收入和中產階級無法負擔新房屋。這一差距體現在2026年1月記錄的127,000套未售房屋中，為2009年以來最高數值。

In response to these systemic constraints, a demographic shift toward multigenerational cohabitation has commenced. National Association of Realtors data indicates that 17% of homebuyers acquired multigenerational properties between July 2023 and June 2024. This trend is most pronounced in California, where Los Angeles leads the nation with a 23.7% share of such listings. Such arrangements serve as a primary mechanism for cost mitigation among diverse age groups.

為了應對這些系統性限制，人口開始向多代共居轉移。全國地產經紀協會的數據顯示，在2023年7月至2024年6月之間，17%的購屋者購買了多代共居房屋。這一趨勢在加州最為顯著，洛杉磯以23.7%的相關房源比例領先全美。此類安排成為不同年齡層降低成本的主要機制。

Institutional responses vary by jurisdiction. While federal spending reductions under the Trump administration are cited as a contributing factor to heightened housing pressures, some municipalities have implemented zoning reforms. Minneapolis is noted for the elimination of single-family-only zoning in its 2040 plan, and New York has proposed the construction of 200,000 new units. However, the Harvard report posits that local initiatives are insufficient without coordinated federal funding to address the intersection of affordability, homelessness, and climate impact.

不同司法管轄區的體制反應各異。雖然川普政府削減聯邦支出被視為加劇住房壓力的因素，但部分市政府實施了分區改革。明尼阿波利斯市在其2040計劃中取消了僅限單一家庭的分區規定而備受關注，紐約則建議興建20萬個新單位。然而，哈佛報告指出，若缺乏協調一致的聯邦資金來解決負擔能力、無家可歸者問題與氣候影響的交集，僅靠地方倡議是不夠的。

The United States continues to face a multifaceted housing crisis characterized by high costs and low mobility, requiring integrated action across all levels of government.

美國將繼續面對一個由高成本與低流動性構成的多面住房危機，需要政府各層級採取整合行動。