Two years ago, Jersey City approved a zoning law that limits where chain stores can be opened.

The ordinance says not all chain stores are banned in the zone, but they cannot take up more than 30 percent of ground-floor commercial space in any one lot in the zone.

It was intended to preserve the character of Downtown neighborhoods and help mom-and-pop retailers thrive.

This week it was reported that the city is poised to block a CVS from opening a new location in a Waterfront building because of the restrictions.

The pharmacy giant signed a long-term lease for nearly 20,000 square feet of space on the…