In any single-family residential zone, a developer may create lots that are smaller than those required under the minimum lot size of individual zoning districts if such developer complies with the provisions of this chapter. The intent is to authorize the developer to decrease lot sizes with the land "saved" being utilized as usable open space, thereby lowering development costs and increasing the amenity of the project without increasing the density beyond what would be permissible if the land were subdivided into the size lots required under each zoning district.