One of the major principles of investing is to "buy low and sell high". Real estate investments can complement one's portfolio, depending on many simultaneous factors. Some investors purchase properties to rent. Others purchase properties to repair, improve upon, and then to sell for a profit. Yet others may acquire real estate to reside and enjoy. Within the context of investing, please describe how each of the following factors may positively or negatively impact one's real estate holdings within the investment portfolio:

- Change in real estate tax rates (county, municipal, and school)

- Factory or plant openings or closings within the area

- Public school system serving the neighborhood

- The attention to neighbors and property upkeep

- The economic health of the community

- Violence or safety records of the neighborhood

- Overall supply and demand for properties within the neighborhood

- The mechanical aptitude of the property owner to repair and maintain such property