Portland, Oregon, has boosted affordable housing by allowing middle housing—townhomes, duplexes, triplexes—on single-family lots, cutting costs by about $300,000 per unit. Oregon's governor aims to expand this statewide. Boise recently updated zoning to allow more housing but requires affordability and sustainability, with results expected in a few years. High costs and interest rates still challenge new construction despite zoning changes.
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