Anglo-American law enables property owners to split up rights to a thing over time among multiple people by breaking their ownership apart into multiple future interests. The system of legal doctrines governing future interests is notorious among lawyers and law students for its complexity. The conveyances property owners use to transfer and subdivide property rights follow rigid syntactic conventions and are governed by an intricate body of interlocking legal doctrines that determine the legal effect of a conveyance over time. These doctrines have been codified, but only in informal and potentially ambiguous ways. However, both the syntactic structure and underlying semantic of conveyances are amenable to analysis using tools and techniques from programming language theory and practice. This paper presents preliminary work in developing a formal model for expressing and analyzing property conveyances.