This ordinance amends Metropolitan Code of Laws, Title 17, Chapter 17.40, to update the requirements for amending an Urban Design Overlay (UDO) in Nashville. The amendment introduces new sections defining 'Major UDO Amendment' and 'Minor UDO Amendment,' outlining distinct review processes for each. It establishes criteria for determining whether a proposed UDO amendment requires a new concept plan or can proceed with an existing one, based on the scope and impact of the changes.