Every square kilometer of surface area on an asteroid is called a “lot”, and represents a location where a building can be built, a lease created, or a Light Transport landed.
Lots are not literal squares, even though they each have roughly a square kilometer of surface area. Rather, they are laid out in a Fibonacci lattice on the surface of the asteroid. Accordingly, they have no fixed shape and are approximately, but not exactly, 1km separated from their neighbors.
The number of lots on an asteroid can be calculated from its radius in meters with the equation
floor(4 * pi * radius2 / 1000000)
The smallest asteroids in Adalia have 13 lots, while the largest, Adalia Prime, has 1768484!