Crown Heights Within the Brooklyn Reshus Harabim Question
Crown Heights is part of Brooklyn's connected street network and also has its own direct local psak.
Crown Heights is part of Brooklyn
Crown Heights is connected to the borough by major avenues, local streets, transit, and continuous public movement. A proposed eruv boundary may enclose a chosen area physically only if each part of that perimeter is halachically valid.
The neighborhood name itself does not isolate its streets from the population and public routes of New York.
Rav Moshe and the large-city rulings
Rav Moshe's responsa analyze Manhattan and Brooklyn as large urban systems. The public proclamations of 5739 repeat the Manhattan prohibition and apply the warning to New York and other major cities.
Those sources address why the question cannot be reduced to the condition of several poles and wires. Reshus harabim, population, walls, openings, and citywide public use come first.
The claimed Crown Heights boundary
Arguments have been made from exterior walls, embankments, and omed merube. Each feature must form part of one continuous enclosure, and every major road, opening, corner, and connection must be treated.
The Crown Heights Rabbonim considered the exterior-wall argument and ruled that it made no change whatsoever to the prohibition.
The direct Crown Heights psak
The neighborhood Rabbonim have ruled that no valid eruv exists anywhere within Crown Heights and that the advertised route may not be relied upon. Carrying remains prohibited on Shabbos and Yom Kippur.
That psak supplies the practical instruction. The broader Brooklyn material explains the halachic setting in which the local ruling was issued.