Site Selection and Assemblage of Land Parcels
Assemblage logic
Assemblage is the process of combining adjacent or nearby parcels into a larger, more valuable whole - the plottage effect, where the combined value exceeds the sum of the parts. A candidate must understand why and when this works, and the traps that make it fail.
Concepts a candidate must know
- Plottage value: the incremental value created by combining parcels into a site large enough for a higher use. The premium exists only if the combined site unlocks a use the individual parcels cannot support.
- Site selection criteria: location and access, visibility, traffic counts, utilities and capacity, zoning/entitlement, topography, environmental constraints, and neighborhood compatibility.
- Assemblage mechanics: option agreements, purchase contracts contingent on securing all parcels, confidentiality, and timing. The broker must control parcels without triggering price escalation.
- Holdout problem: one owner refuses to sell or demands a premium, which can stall or kill the project. Questions love the holdout as the reason assemblage fails.
- Assemblage costs: acquisition premiums, demolition/relocation, and extended holding costs often offset the plottage premium.
Worked rule of thumb
If three parcels are worth $200k, $250k, and $300k separately ($750k total), and the combined site supports a use worth $1,050k, the plottage premium is $300k - but only if all three can be controlled. Subtract any holdout premium and extra holding costs to find the true net gain.
Traps
Assuming plottage always exists; ignoring the holdout risk; and forgetting that assembling non-contiguous parcels usually creates no plottage at all. Also watch for questions where zoning prevents the combined use - then the premium evaporates.