Final answer:
The city office in charge of zoning changes is commonly known as the Department of Planning or the Zoning Department.
Step-by-step explanation:
When a property owner requests a zoning change, the city office in charge of those changes is commonly known as the Department of Planning or the Zoning Department.
These city offices are responsible for reviewing and approving zoning change requests, as well as managing and enforcing zoning regulations within the city.
For example, in New York City, the Department of City Planning handles zoning changes and ensures that land use within the city is in accordance with zoning laws.