The intent of this section is to permit, as a conditional use, the creation of single-family detached dwellings on smaller lots than would otherwise be permitted within certain districts for the purpose of creating open space in usable areas and quantities, preserving desirable natural features and tree cover, and encouraging high quality of lot layout, planning and land design which will stabilize and enhance the character of the district of which they are a part, and to preserve the health, welfare and safety of the entire community.