Developed land, which is the part of total land for which basic facilities have been provided. Floor-space, which is the amount of building area available for specific uses. Different kinds of floor-space may use land from one or more categories of developed land depending on policy.
Economic sectors consume different amounts of different types of floor-space.
Demand at each level competes for availability at the next, driving the prices up until there's equilibrium. This four-level scheme allows the simulation of policies over the amount of construction, over developed land, and over total land availability. Floor-space may also consume more than one kind of developed land, according to policy. Total, or developed land that's not used for buildings is considered available for future use. The amount of those kinds of land may be altered exogenously in certain simulation scenarios to reflect foreseen investments or policies.