Rising inventory and softening buyer demand are the main drivers behind the market-implied 47.5% probability on a DC Metro median home value below $503,000 by year-end. Active listings across the metro rose nearly 20% year-over-year through early October 2026, while new purchase contracts fell 19.5% and median days to contract lengthened, reflecting higher mortgage rates and reduced affordability. Zillow Home Value Index figures for the broader area hovered near $580,000 mid-year before showing modest sequential softening, and September median listing prices for the Washington-Arlington-Alexandria CBSA reached $572,150 amid more price reductions. Traders appear to price in further cooling into December, when seasonal slowdowns typically amplify any downward pressure from elevated supply and restrained transaction volumes.