Associated Issues

Details:

Question - is the flower/ plant bed running in between 520 W Forrest Hill and the neighbor house , to the sidewalk ALLOWED ???? It’s a flagstone divider filled with trees and plants . To me ,it almost represents a FENCE / divider ! No one has front yard fences on the street . Is this allowed? Also , do they have a building permit for the front steps , flower beds and porch remodeling currently going on now ? Can this be checked out ? Thank you