Final answer:
To build an apartment building on a lot zoned for single family, one needs to apply for rezoning or a variance through a legal process involving public hearings and local board approvals. Zoning regulations define the type of constructions permissible and include restrictions that may affect the feasibility of the project.
Step-by-step explanation:
To build an apartment building on a lot zoned for single-family residences, you would typically need to apply for a rezoning or a variance. Zoning regulations set by local governments often define the types of buildings that can be built on a certain lot, including restrictions on the number of dwellings, building setbacks, and the height and size of buildings. To change the permitted use from single-family to multi-family dwellings (e.g., an apartment building), a property owner must go through a legal process which usually involves a public hearing and approval by the local planning commission or board.
Furthermore, if your proposed project is located in an area of historic or cultural significance, you may also be required to ensure that certain architectural features are preserved in accordance with the local zoning ordinance to maintain the area's character. The exact process and requirements can vary greatly depending on local laws and the specific characteristics of the property involved.