1▪ your property value goes up when your neighbor fixes up his yard and paints his house
2▪ a skateboard park opens up down the street so your sidewalk and driveway are free from those punk-neighborhood skaters
3▪ a new restaurant opens in your neighborhood and now your favorite restaurant is less crowded

negative:
1▪ your neighbor gets a stupid chihuahua and it barks all night
2▪ you are eating on the patio of a restaurant and some inconsiderate jerk is smoking at the next table and you are breathing in their smoke
3▪ a local factory pollutes the nearby river and it is filthy and full of gunk when you want to use it for recreation