The "greater" NYC metro area is packed with data centers for obvious reasons, but there just aren't that many in Newark proper. Working around all the older construction is kind of a pain.

I do property valuation and have a little experience in data centers, IIRC the biggest concentration of data centers in the area is Secaucus, which is more or less an industrial hub and a train station. Newark is certainly an option but I'd first take a look at Jersey City and the rest of Hudson County, maybe a little up north too if the price is right.