The Knights purchased a lot and built their home with the basement apartment, which they then rented. There was a deed restriction prohibiting such use in the subdivision. What would happen if the homeowners or HOA took no action against the Knights?

The restriction could be lost through patterns and exceptions.

The city could make a zoning change to eliminate the restriction.

Nothing. The deed restriction is not lost through non$-$enforcement.

It is the HOA and owners choice to bring enforcement action, but it is not necessary.