Honolulu Study Demonstrates How New Housing Triggers Significant Rent Reductions in Older Units

A recent study from Honolulu provides compelling evidence for the housing market phenomenon known as filtering, where new construction indirectly lowers rents in older housing stock. Researchers Limin Fang, Emi Kim, and Justin Tyndall examined "moving chains" initiated by residents of The Central, a 512-home tower completed in 2021. They found that homes vacated in the first round of moves to The Central saw prices drop by 38% per square foot, with subsequent moves in the chain leading to a 44% reduction.

The study, which combined property assessments, deed transfers, and address history, identified 180 confirmed vacancies linked to The Central over three years. While market-rate units generated more vacancies per home (0.43) than income-restricted units (0.29), vacancies from income-restricted homes filtered into an even lower price tier. The findings suggest that programs like Hawaiʻi's 201H, which streamline development and may include requirements for below-market-rate units, can effectively channel filtering benefits. This research highlights that new housing supply creates a cascade of vacancies, ultimately benefiting households across various income levels who never directly occupy the new development.