Office = place of work/business.

• He went to the office at 9 a.m.
• It’s only a few minutes walk to her office.
• Post-office, income tax office.

The good offices = influence, esp., with a person in a position of power, assistance, intervention, mediation.

• His family escaped to Canada through the good offices of a Jewish Agency.
• She got her job in the bank through the good offices of her uncle who was a director of the Bank.
• He was able to recover his lost documents through the good offices of Indian Embassy.
• I got the job through the good offices of a friend.