Petersen's Boatyard

Historical image: Circa 1940 (WWII era), Source: Upper Nyack Centennial gallery. "In early 1941, with the Second World War imminent, Petersen received government contracts to build two 110- foot wooden-hulled sub chasers. The yard would go on to produce about ten sub chasers and over forty 85-foot airsea rescue boats during WWII. There were more than 300 men employed there with an office set up by the Navy. It was a seven-day a week operation. All the hulls were hand-framed; patterns and templates were shaped in the yard’s three-story mold loft. Workmen laid out whole ships on the floor of the loft from blueprints" [source (edited)].

Present-day image: © Google (via Earth). The boatyard is now North River Shipyard.