Exterior Walls Do Not Change the Crown Heights Ruling
Walls, embankments, highways, railway areas, and building lines outside Crown Heights have been presented as parts of a larger enclosure. The Crown Heights Rabbonim considered that argument and ruled that it did not permit carrying in the neighborhood.
Walls beyond Crown Heights
The proposed exterior enclosure is not a single visible wall surrounding Crown Heights. It combines structures spread across a much wider area: walls and building lines, highway and railway edges, embankments, fences, and other features said to close portions of the perimeter.
Each section has to qualify as a halachic wall and connect to the next section. Openings, bridges, tunnels, driveways, crossings, changes in elevation, and the direction in which a wall faces can affect the calculation. The area being measured must also be defined before a percentage of closed and open perimeter has meaning.
Omed merube is a halachic calculation of standing wall against open space. It does not turn every structure somewhere along a broad route into one continuous enclosure, and it does not answer separate questions about a reshus harabim.
No change whatsoever
Rabbi Osdoba and Rabbi Braun addressed the exterior-wall argument directly. Their ruling was that it made “no change whatsoever” to their earlier psak and to the categorical rejection of the eruv by the neighborhood's Rabbonim (20 Teves 5783).
The practical result is straightforward. A claimed outer perimeter does not supply permission to carry in Crown Heights, and inspection of poles and wires within that system does not change the local ruling.