As cities and towns expanded beyond their original legal and ritual boundaries, formerly intramural cemeteries had to be redefined as "outside the city" with deeds and markers, or their burials moved, releasing much-needed land for public or private use. Some developers seem to have simply removed or ignored burial markers. Burial plots could be divided, subdivided and sold on, in parts or as a whole, or let out to help cover the cost; "guest burials" were sometimes explicitly forbidden, for fear that they set a precedent of habitual usage in claiming rights to the tomb. Profits could be made from sacred land (containing graves or other "loci religiosi"), through donations or the sale of produce, such as flowers grown in a tomb's garden, but in theory (and in law) any resulting profit should be used only to improve that land or its facilities; for example, an improvement to the water supply for the walled gardens surrounding the tombs.