The R-3 multifamily residential district is a district with a limited number of multifamily residences designed to maintain, preserve and protect a character of development on lots with a minimum net area of six thousand square feet and with no more than one dwelling unit and customary accessory buildings for every two thousand square feet of net lot area, not to exceed eighteen dwelling units per acre. This zone is consistent with the high-density designation of the Wheatland general plan.