DearCustomer- Unless there is some local zoning ordinance to the contrary he can build it anywhere on his property up to the property line. There are numerous local ordinances that include setbacks, height restrictions and other limitations but otherwise he can build the wall where he pleases on his own property.
I do not have access to all the local zoning restriction or local building rules from this website so you may want to contact your local town or city's zoning department as ask if there are any setback or height restrictions on walls and/or fences.
If it has been there for that long then it would be grandfathered in to any ordinance. I do not have access to the local ordinances from here but from these facts 'm quite certain the wall is permissible. You can call the Borough offices and ask. I'm not certain from your question what the exact problem is with the wall, especially if it has been there for so long?
I see - well they have a right to remove the flowers since it is their property and in order to build a new fence they will likely need a building permit. The city will not issue a permit if the new structure is in violation of the ordinances so if they start building you can call the city to see if they obtained a permit. If they did you can't do much about the wall but if they try to built without a permit the city will stop them and solve your problem.
It sounds fine to me. It has no legal significance but you may want to call the city just to see if there is a setback law that you could quote in your letter. Threatening legal action without a law to back it up really is just a threat and can create even more animosity.
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