As of my last update, there isn't specific information available about a "J Block" in Park View City Islamabad. However, housing societies commonly have multiple blocks designated by letters or numbers. If "J Block" exists, it would likely offer similar amenities and residential options as other blocks within Park View City, such as plots, houses, parks, mosques, and commercial areas.
For precise details about J Block, including available properties, facilities, and development status, reaching out to the Park View City management or local real estate agents familiar with the area would be the best course of action. They can provide up-to-date information and assist with any inquiries you may have.