Over the past 15 years, Panepinto Properties and Ironstate Development have transformed an entire block in the heart of downtown Jersey City, delivering three towers with nearly 1,500 apartments, along with a 152-key hotel, a 1,000-space parking garage and street-level retail space along Columbus Drive. In the process, they have anchored the resurgence of a neighborhood just a few blocks from the Hudson River, paving the way for other projects in the booming multifamily submarket.