At the Office
Prepositions of Place, Similarity and Function
Use 'in' with countries, cities, towns and regions.
In Michigan, a debtor's privacy rights are revocable in the case of delinquency.
My client has assets and liabilities in two countries.
Use 'at' for place in a city, town or village.
We will meet you at the Citigroup building.
She checks her bank balance at the Bank.
Like and As
Use 'like' as a preposition to express that two are objects are similar in some characteristic.
Having majority interest in the company is like running your own baseball team.
These are outstanding credits like the ones I sent out last week.
Use 'as' to express the function that a person takes in an organization.
Sam works as a portfolio manager.
As an employee of the firm you are expected to perform due diligence.