Duluth UDC § 504.08

a. Any changes that, in the opinion of the Planning and Development Director, result in a development of such intent and character that has not been conceptually approved by the City Council shall require additional approval in accordance with procedures established in the Procedures and Permits Article for a revision of conditions of rezoning approval. Such changes may be additions in the types of land uses, increases in square footage or density, decreases in lot sizes, changes in the location or dimensions of major streets, decreases in dwelling unit floor areas, major alterations in the land use patterns, or other substantial changes that are inconsistent with the summary report or the master concept plan approved for the PUD. Otherwise, minor changes may be approved by the Planning and Development Director prior to issuance of development or building permits. b. As development of each portion of a planned unit development proceeds, the master concept plan map shall be updated to show each final subdivision plat as it is approved for recording, and each site plan for a multi-family or non-residential project upon its approval for a land disturbing activity permit. No certificates of occupancy will be issued within those areas until the zoning official has received the updated master concept plan map.