Capturing Metro Uplift: Density Bonuses or a Betterment Levy
A metro line opens in a city of 1.4 million. Within 1.2 km of the new station, residential land values rose 65% in three years, from about 18 million to 30 million toman per m². About 40% of households in the station area are renters; 22% of parcels are vacant or underused. The municipality wants to capture part of the uplift to pay for station-area sidewalks, drainage, and a feeder bus terminal. Two options are on the table: (a) sell density bonuses on 12 parcels, raising FAR from 2.0 to 4.0, with proceeds to the infrastructure fund; (b) impose a betterment levy on all benefited properties at 20% of the uplift. The mayor favors (a) because it is faster and the market will build what it wants. The finance department warns that the levy will be contested. Tenant groups fear displacement.
1. Compare the incidence and efficiency of the two instruments. Who actually bears the cost in each case, and what does each instrument fail to address?
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Both instruments capture part of the uplift, but they differ in incidence and efficiency.
A betterment levy of 20% on all benefited properties is broad and captures windfall gains from the public investment. Its incidence depends on elasticity. In a station area with fixed supply in the short run, much of the levy would fall on landowners as a lower net price, but over time some could pass to tenants through higher rents, especially where supply is constrained.
A density bonus sale is narrower. It captures value only on 12 parcels and creates additional floor space, which can help supply but also raises land values and may overwhelm sidewalks and drainage. It is faster and administratively simpler, and developers may accept it because they receive something tangible.
The equity problem differs. The levy is visible and contested; the bonus is hidden in the approval process and may be regressive if only large owners can use it. Neither instrument addresses displacement of the 40% renter households. That requires a separate tenancy protection measure.
2. Which option do you recommend, and what package would you design? Be specific about rates, eligibility, and use of revenue.
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Recommend a combined package, with the levy as the backbone and the bonus as a limited, negotiated tool.
- Set the levy at 15-20% of the uplift on all benefited properties, phased over two years and payable in installments, with an exemption threshold for owner-occupied low-value homes.
- Use the revenue for station-area sidewalks, drainage, and feeder buses, and publish the budget.
- Allow density bonuses only on the 22% vacant or underused parcels, not on occupied rental buildings, and only where infrastructure capacity is demonstrated and 10-15% of units are affordable or small units.
- Protect tenants with a relocation and rent-stabilization clause during redevelopment.
- Publish the valuation method and an appeal route.
The mayor's claim that the market will build what it wants is not a land-use policy. Without conditions, the bonus transfers public value to a few owners and leaves the infrastructure unfunded. The levy is the fairer base; the bonus is a supplement, not a substitute.
3. What risks and monitoring indicators would you attach to this package?
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Risks: valuation disputes, appeals, delayed revenue, capitalization of the levy into lower land prices (intended but politically contested), developer resistance and permit delays, renter displacement, and infrastructure lagging behind density.
Monitor:
- Building permits and units by size and tenure.
- Rents in the station area compared with control areas.
- Revenue actually collected and spent in the station area.
- Pedestrian and drainage capacity.
- Number of relocated households and whether they remained in the district.
Evaluate after three years. If rents rise sharply without new supply, tighten the affordable requirement and slow bonus approvals. If the levy is struck down, do not fall back on unfunded density; use an infrastructure fee tied to building permits instead.