What factor is crucial in determining the boundaries of a court?

The crucial factor in determining the boundaries of a court is the building lines setting the court's periphery. Building lines are specific regulations that indicate how far a structure must be set back from property lines or designated areas. These lines help in defining the physical dimensions of a court, ensuring that structures do not encroach on designated spaces, thereby maintaining the intended use and environment of the property.

This contrasts with other factors like the type of structure built, which relates more to the purpose and design rather than boundary determination. Zoning classification, while important for overall land use, typically dictates larger land-use policies rather than specific physical boundaries of a court. Lastly, surrounding landscaping may enhance the visual appeal or functionality of an area but does not play a direct role in establishing the legal or regulatory limits of a court. Thus, building lines are the definitive measurements that outline a court's boundaries.