The Philadelphia City Council enacted Bill No. 250523 on June 12, 2025, significantly amending Title 14 of The Philadelphia Code, known as "Zoning and Planning." This comprehensive ordinance introduces revisions, clarifications, and technical changes across numerous chapters, impacting various aspects of urban development. Key modifications include the refinement of definitions for terms such as "Flag Lot," "Promoted Event," and "Pool or Billiards Room," and the detailing of the City Planning Commission's review and prerequisite approval authority, particularly concerning mixed-income housing bonuses and steep slope protection permits. The legislation also adjusts use regulations, modifying allowable uses in residential districts and for specific areas like Germantown Avenue. Dimensional standards have been updated, revising minimum lot areas for certain residential districts and establishing new criteria for green roofs. Substantial changes were made to landscape and tree preservation requirements, covering detailed plans, buffering standards between different zoning districts, heritage tree protection, and replacement guidelines. Furthermore, the bill overhauls parking and loading standards, addressing applicability to changes of use, new parking lots, modifications to existing lots, and specific landscape and screening mandates. Finally, the amendments also impact the composition of the Historical Commission and modify provisions related to demolition moratoriums within historic districts.