The Brooklyn Army Terminal is celebrating its 100th birthday, and the city-owned complex is turning into a thriving light manufacturing and food hub.

The 4-million-square-foot development on the southwestern end of Brooklyn is a block from the subway and has a ferry at its dock.

Its long, low-rise buildings stretch for blocks sitting alongside the harbor.

Inside, artists are subleasing for as little as $2.50 a square foot while newer deals with the city are being signed for about $20 per square foot. There are no property taxes.

Last week, the city announced 500,000 square feet of space cleaned up and ready to rent.

There is also a 55,000-square-foot food annex, workforce training lab, a Futureworks Center for Advanced Manufacturing for sharing expensive high-tech equipment, and Base Camp, a networking lounge and event space.

Tenants — including Jacques Torres Chocolate, The Konery ice cream cones and MOMO dressing — gave out treats and praised the project, which has allowed them to grow and thrive.

Another tenant, electronic security manufacturer Altronix, signed a new lease to more than double in size and expand by 130,000 square feet.

It’s worth the ferry or subway ride to check it all out.