superficies

n. [ L., fr. super above, over + facies make, figure, shape. See Surface. ] 1. The surface; the exterior part, superficial area, or face of a thing. [ 1913 Webster ]

2. (Civil Law) (a) Everything on the surface of a piece of ground, or of a building, so closely connected by art or nature as to constitute a part of it, as houses, or other superstructures, fences, trees, vines, etc. (b) A real right consisting of a grant by a landed proprietor of a piece of ground, bearing a strong resemblance to the long building leases granted by landholders in England, in consideration of a rent, and under reservation of the ownership of the soil. Bouvier. Wharton. [ 1913 Webster ]