The Master Plan will evolve over a number of years responding to market conditions, improvements in technology and community input. The key master plan concepts are identified in a Preliminary Land Development Plan (PLDP) which creates the framework of regulating plans for streets, blocks and open spaces and defines the relationship between buildings and the public rights of way. Subsequent specific development proposals will be evaluated for consistency to the PLDP. The PLDP will be presented for public input and is ultimately adopted by the City of Pittsburgh Planning Commission. New zoning is being created for the site under the Special Planned District (SPD) mechanism; the new zoning code will support flexibility of uses and embody the form-based code tools of the PLDP to create a dense urban district. The SPD is presented for approval by the Pittsburgh City Council.