Purpose. It is the purpose of these zones to recognize and preserve the character of older, established residential neighborhoods within the City. Because of the existing stock of well-maintained older homes, because of the allowance for smaller lot areas and because of the variety of housing types permitted, it is anticipated that these zones will continue to provide an abundant supply of affordable units. It is important that zone requirements and design standards not be sacrificed to allow overdevelopment of properties, as this would negatively impact upon the character and stability of these neighborhoods. It is the intent that a single-family dwelling be the preferred use of property, as none of the other permitted uses are to be considered unless all other requirements of this chapter can be met. For example, there is not an automatic or implied right to develop a professional building. A professional building should only be considered if all the requirements of this chapter, including design standards, can be met.