Sandpiper Jersey is taking legal advice over a disagreement with the developers of the Liberty Wharf shopping centre.
The company, which owns the franchise for Marks and Spencer, said it was unhappy about the overhead bills.
Harcourt finally finished the development of Liberty Wharf after disagreements with other developers over the right to do the work.
The company reassured the States of its ability to carry out the work despite lawsuits elsewhere.
The £330m development opened in the autumn even though several of the shop spaces were unoccupied.
Now one of the major tenants, Sandpiper, which runs the Marks and Spencer home store, is unhappy about the extra charges it is expected to pay.
Sandpiper's chief executive Tony O'Neil confirmed to BBC Jersey there was a dispute over some overheads at the site.
He said both parties were getting legal advice and hoped to settle the matter before it went to court.
BBC Jersey has invited Harcourt to comment, but is yet to receive a response.