Single-family homes add garage apartments or convert into duplexes. Duplexes are redeveloped to become fourplex units. Commercial buildings are subdivided to allow more tenants. Gaps are filled in. Space is used more productively. The key is to create this feedback loop over a broad area. Freeze neighborhoods in place with zoning and regulation, and rising land values will merely displace existing residents, creating pockets of affluence in a pool of stagnation and decline. Grow neighborhoods in large leaps instead of incrementally and it will crowd out most investments, causing the same mix
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