First, I would like to thank the designer (GW_196) of this sidewalk model that allowed me to enhance the super cool Firehouse designed by Nooks4Books.

I took the liberty to take the original sidewalk model and made modifications to fit around the firehouse. This was done within Bambu Studio using the measuring tool and the cut tool. The screenshot is the final product. I printed it with basic gray PLA (0.4 mm nozzle) on an X1C. 

I hope this works for you.