Thank You For Thank You To Neighbor
Hi {Neighbor},
I just wanted to say thank you for being a wonderful neighbor. We've lived {next to/across the street from} each other for {number of} years, and I can't count the number of times you've lent me a hand.
Thank you for {describe occasions when they've helped you out}. I'm grateful to have you as my neighbor!
Cheers,
{Your Name}