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The tough suburban office market has caught up with at least one Connecticut Bank.

The publicly-traded holding company for New Canaan-based Bankwell filed a report with federal stock regulators warning that its third-quarter earnings “will be adversely impacted” by a $13.7 million commercial real estate loan gone bad.

The loan is part of an $84 million multi-bank club deal that financed an unspecified class A New Jersey office park. Bankwell plans to record an $8.2 million charge-off in its third-quarter earnings, the bank’s filing said.

The loan was reported as non-performing in Bankwell’s second-quarter earnings report and had no previous reserve associated with it given a $105.1 million appraised value the office park received in April.

However, by Sept. 30, the borrower was in default and the group of banks that financed the property began foreclosure proceedings that generated a mere $36.2 million valuation.

The bank’s remaining exposure in the deal, post-charge-off, is $5.5 million, the filing stated.