Mulberry Commons, once called Triangle Park, is a planned public park in Newark, New Jersey. It was first proposed in 2005 to be the centerpiece of 22 acres (8.9 ha) of the city's Downtown surrounded by Gateway Center, Newark Penn Station, Government Center and Prudential Center, an arena which opened in 2007. The city had acquired deed to the park land in conjunction with the construction of the arena, but the project had not been further developed.
In March 2016, Mayor Ras J. Baraka announced that park design would begin in April after a request for qualifications, with a projected completion in 2018. The plan includes a city square of 2.5 acres (1.0 ha) connecting to footbridge of 0.5 miles (0.80 km) over McCarter Highway and the Northeast Corridor to the Ironbound neighborhood with direct access to the train platforms at Penn Station.
The area around the Mulberry Commons, much of it owned by Edison Properties, will be developed by the company and other partners, initially converting the Newark Warehouse Building into retail and commercial space. called Ironside Newark.
An official opening ceremony for the park took place October 2, 2017.
The Triangle Park site is a parcel of approximately 3 acres (1.2 ha) in the shape of the triangle. The Central Graphic Arts Building, a 1907 Newark landmark also known as the Newark Warehouse Building, is located adjacent to the northeastern side of the park site, while Hamilton Street creates the southern side. It is situated within the larger block bounded Edison Place, Lafayette Street, McCarter Highway and Mulberry Street.
The site was earlier the rail yard of the western terminus of the Central Railroad of New Jersey's Newark and New York Railroad until service was discontinued and is used as a parking lot operated by Edison Park Fast operations, which owns numerous lots in the city.