Density is frequently proposed as the remedy for urban inefficiency. It is less frequently examined as a mechanism of dispossession. When density is delivered through market redevelopment alone, the land value uplift it produces is captured by owners, and the households that made the location valuable are priced out of it.
This paper sets out four instruments that separate density from displacement: land value capture at the point of rezoning, mandatory tenure mixing at the block rather than the precinct scale, phased delivery that houses existing residents first, and public retention of the ground plane.
The uplift problem
Rezoning creates value instantly and without cost to the owner. Where that uplift is not partially captured for public purpose, it becomes the primary driver of speculative land holding — the same behaviour that produced the vacancy the regeneration was meant to solve.
Capture mechanisms need not be punitive. A development charge indexed to the granted bulk, ring-fenced to the precinct's infrastructure and public realm, is generally accepted by developers because it is predictable and visibly returned to the asset.
Tenure mixing at block scale
Precinct-level tenure targets are typically met by concentrating affordable units in the least valuable corner. Applying the target at block scale is administratively harder and socially far more durable.
The evidence from mixed-tenure blocks suggests that the variable which determines social outcome is not the proportion of subsidised units but whether the entrances, courtyards and services are shared.
Sequencing
Where existing residents are rehoused within the first phase, on the same land, the political and legal risk of subsequent phases falls sharply. Where they are rehoused last, projects stall.
This is not primarily an ethical argument. It is a delivery argument that happens to coincide with an ethical one.