Architecture firm WORKac just released new images of their latest work on the Stealth Building, located in the trendy Tribeca neighborhood of NYC. WORKac was tasked with building a penthouse extension above the existing structure - a difficult undertaking as New York law states any rooftop addition must be invisible from the street. In order to follow these regulations, the firm created a folded metal roof that minimizes its visual presence. Furthermore, the building facade, originally constructed in 1857, was restored with a beautiful charcoal paint job. Take a look at official images of the Stealth Building's new look below and click here for more info.