Final answer:
The owners of the apartment building are permitted to sell the units as residential condominiums, add more apartments within the former zoning classification, continue the current use without enlargement or discontinuation, and refurbish and expand the building.
Step-by-step explanation:
If an apartment building's zoning classification changes from multifamily use to detached single-family use only, the owners of the apartment building are permitted to:
- Sell the apartment units as residential condominiums
- Add more apartments as long as they comply with the requirements of the former zoning classification
- Continue the present use as long as that use is not enlarged or discontinued
- Refurbish and expand the current building
These options may depend on local zoning ordinances and regulations, so it's important for owners to consult with local authorities before making any decisions.