structural:reformatting
In planned communities

These CCRs might, for example, dictate the types of structures that can be built (e.g., a CCR may prohibit any type of modular, prefabricated, or mobile home or may require the structure to be a minimum size), appearance (e.g., no junk cars), or other uses (e.g., no operation of home-based business, no pets except traditional household animals). The purpose of this is to maintain a neighborhood character or prevent improper use of the land. Many covenants of this nature were imposed in the United States in the 1920s through the 1940s, before zoning became widespread. However, many modern developments are also restricted by covenants on property titles; this is often justified as a means of preserving the values of the houses in the area. Covenant restrictions can be removed through court action, although this process is lengthy and often very expensive. In some cases it even involves a plebiscite of nearby property owners. Although control of such planning issues is often governed by local planning schemes or other regulatory frameworks rather than through the use of covenants, there are still many covenants imposed, particularly in states that limit the level of control over real property use that may be exercised by local governments. In Houston, Texas, the lack of a local zoning ordinance means that property owners make heavy use of deed restrictions to prevent unwanted development.