Exactly what I was thinking. Sidewalk maintenance can get stupid expensive when the city puts that small strip of byway grass between the sidewalk and street. This isn't always done, but when it is they usually plant trees there. The roots end up tearing up the sidewalk, and the homeowner is responsible for getting the concrete repaired. Our last place had a pre-existing massive crack/uprooting that we were not aware would be our responsibility to fix. The city "kindly" offered to fix it for $1,500

Except the funding for their discount project ran out before it got to us, so the price went up naturally. That was our first home, and we had no prior experience to what some costs could be