This book explains why the earliest cities had grid-form street systems, what conditions led to their being overwhelmingly preferred for 5000 years throughout the world, why the Founding Fathers wanted gridform cities and how they affect economic transactions. Real property has been instrumental in forming urban settlements for 5000 years, but virtually all urban form commentary, theory and research has ignored this reality. The result is an incomplete and flawed understanding of cities. Real property became a means of arranging spatial patterns caused by millennia of human evolutionary and historical developments with respect to access and movement. As a result, access to resources of all types became a regulatory mechanism controlled, at least in part, by real property ownership.