Randy Patterson, Lancaster's director of economic development and neighborhood, will retire in June next year.
His successor will head a reorganized department with a new name, Mayor Danene Sorace told City Council on Tuesday.
Patterson has served the city since 2006. He has done "amazing things," and the city is far stronger thanks to his efforts, Sorace said.
She said her administration has decided to consolidate the city's various planning functions under the umbrella of Patterson's department.
Renamed the Department of Planning and Community Development, it will be charged, among other things, with issuing the first update to the city's comprehensive plan since 1993.
The city has posted job descriptions for its director and also for the director of public works, Sorace said. Charlotte Katzenmoyer, who had held the latter position, left the administration in late October.
Patterson will remain part-time as a consultant, continuing his role as executive director the City Revitalization & Improvement Zone program, the mayor said.