C.__May allow a precertified development to be located in any area where other residential development is allowed as long as public sewer is available to the precertified development either through an existing line or one that could be extended to that development. If a municipal zoning district enacted pursuant to a consistent comprehensive plan permits only single-family dwellings, the precertified development must be restricted to single- family dwellings, accessory dwelling units and small-scale nonresidential structures and uses found by the board to be integral to the development;

D.__Shall apply to a precertified development the same municipal subdivision and site plan reviews that other residential developments in the municipality are subject to, except that such reviews may not require dimensional standards for lots, buildings or roads in excess of the design guidelines established pursuant to subsection 6.__ Municipal subdivision and site plan reviews of precertified developments must be completed within 180 days of the submission of a complete application for such reviews;

E.__May substitute its own definition of "accessory dwelling unit" for the definition in subsection 3, paragraph A as long as that definition does not have the effect of prohibiting such a unit in an affordable neighborhood development; and

F.__May not impose an impact fee on an affordable neighborhood development.

6.__Design guidelines; rule.__The board shall adopt by rule design guidelines for an affordable neighborhood development. The State Planning Office, in cooperation with the board, shall prepare draft guidelines for the board's consideration.__ The guidelines must include submission requirements and related fees and must generally respect the principles of walkable neighborhoods with a variety of lot sizes and types of housing for households of different incomes that respect the natural environment, provide for adequate fire protection and public safety and provide for appropriate internal open space and other