I would stake 330 bodygrips in his frequently used runs.
That's what we used earlier this year. Got the one under our shop about 4 hours after we set the trap.
A well placed .177 pellet will do the trick. My neighbor has got 4 that way this year. Prefer the .22lr but understand the being in the city limits part. I have to many skunks around here to trap anything. Best of luck.