A system and method of the present invention, in at least some embodiments, provides such a solution for determination of the boundaries of a parcel through a calculable solution, which is also operable when multiple units within a parcel are owned by different entities. The solution features calculation of a centroid that also features altitude. Optionally, the centroid is calculated as a single three dimensional (3D) centroid. Alternatively, it is calculated as a two dimensional centroid and then the third dimension is calculated separately.