The parkway tree out front was there before you were. Its roots worked under the sidewalk, and one slab now sits up at a joint, high enough that you step over it without looking.
The belief is that it is the city’s tree on the city’s strip, so the city fixes the concrete. In California the default runs the other way, and your city decides whether it takes tree damage back.
If the slab out front is lifted, the job worth knowing about is pricing the sidewalk repair with a concrete contractor, so the number is yours before a notice arrives…